diff --git a/lib/std/array_list.zig b/lib/std/array_list.zig
index e064b38566..a7432a30ae 100644
--- a/lib/std/array_list.zig
+++ b/lib/std/array_list.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/array_list_sentineled.zig b/lib/std/array_list_sentineled.zig
index 828be7462f..d73367327e 100644
--- a/lib/std/array_list_sentineled.zig
+++ b/lib/std/array_list_sentineled.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const mem = std.mem;
diff --git a/lib/std/ascii.zig b/lib/std/ascii.zig
index 20bd9e47eb..25c34ef0cc 100644
--- a/lib/std/ascii.zig
+++ b/lib/std/ascii.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Does NOT look at the locale the way C89's toupper(3), isspace() et cetera does.
 // I could have taken only a u7 to make this clear, but it would be slower
 // It is my opinion that encodings other than UTF-8 should not be supported.
diff --git a/lib/std/atomic.zig b/lib/std/atomic.zig
index 6f7b4fe75d..c465708ffa 100644
--- a/lib/std/atomic.zig
+++ b/lib/std/atomic.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const Stack = @import("atomic/stack.zig").Stack;
 pub const Queue = @import("atomic/queue.zig").Queue;
 pub const Int = @import("atomic/int.zig").Int;
diff --git a/lib/std/atomic/int.zig b/lib/std/atomic/int.zig
index 446059e7ef..ae8c8da778 100644
--- a/lib/std/atomic/int.zig
+++ b/lib/std/atomic/int.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Thread-safe, lock-free integer
 pub fn Int(comptime T: type) type {
     return struct {
diff --git a/lib/std/atomic/queue.zig b/lib/std/atomic/queue.zig
index 4df7522f29..dd139106b4 100644
--- a/lib/std/atomic/queue.zig
+++ b/lib/std/atomic/queue.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/atomic/stack.zig b/lib/std/atomic/stack.zig
index db749ecaac..1e289bae70 100644
--- a/lib/std/atomic/stack.zig
+++ b/lib/std/atomic/stack.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const assert = std.debug.assert;
 const builtin = @import("builtin");
 const expect = std.testing.expect;
diff --git a/lib/std/base64.zig b/lib/std/base64.zig
index 39ad811eb6..0b91a1cf0a 100644
--- a/lib/std/base64.zig
+++ b/lib/std/base64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/bloom_filter.zig b/lib/std/bloom_filter.zig
index 80e168b8fd..34fa42fe00 100644
--- a/lib/std/bloom_filter.zig
+++ b/lib/std/bloom_filter.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const math = std.math;
diff --git a/lib/std/buf_map.zig b/lib/std/buf_map.zig
index 5cf4a54ed3..0fb2156c43 100644
--- a/lib/std/buf_map.zig
+++ b/lib/std/buf_map.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const StringHashMap = std.StringHashMap;
 const mem = std.mem;
diff --git a/lib/std/buf_set.zig b/lib/std/buf_set.zig
index d8a0264bd7..1f5dda09c2 100644
--- a/lib/std/buf_set.zig
+++ b/lib/std/buf_set.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const StringHashMap = std.StringHashMap;
 const mem = @import("mem.zig");
diff --git a/lib/std/build.zig b/lib/std/build.zig
index be39e8010c..1673737bef 100644
--- a/lib/std/build.zig
+++ b/lib/std/build.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/build/check_file.zig b/lib/std/build/check_file.zig
index 2d8e58f92c..e1372c0fe9 100644
--- a/lib/std/build/check_file.zig
+++ b/lib/std/build/check_file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = std.build;
 const Step = build.Step;
diff --git a/lib/std/build/emit_raw.zig b/lib/std/build/emit_raw.zig
index 688a50e8fa..d499df1817 100644
--- a/lib/std/build/emit_raw.zig
+++ b/lib/std/build/emit_raw.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 const Allocator = std.mem.Allocator;
diff --git a/lib/std/build/fmt.zig b/lib/std/build/fmt.zig
index 8fb12df824..8f0176c00e 100644
--- a/lib/std/build/fmt.zig
+++ b/lib/std/build/fmt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = @import("../build.zig");
 const Step = build.Step;
diff --git a/lib/std/build/run.zig b/lib/std/build/run.zig
index 839e177edd..71e0d614f5 100644
--- a/lib/std/build/run.zig
+++ b/lib/std/build/run.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const build = std.build;
diff --git a/lib/std/build/translate_c.zig b/lib/std/build/translate_c.zig
index 1bc36ba8c4..8ca2b87209 100644
--- a/lib/std/build/translate_c.zig
+++ b/lib/std/build/translate_c.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = std.build;
 const Step = build.Step;
diff --git a/lib/std/build/write_file.zig b/lib/std/build/write_file.zig
index ad0e13bed2..fe15e6e0e3 100644
--- a/lib/std/build/write_file.zig
+++ b/lib/std/build/write_file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = @import("../build.zig");
 const Step = build.Step;
diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index 49edab1fd7..7f3fcfc96c 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub usingnamespace @import("builtin");
 
 /// Deprecated: use `std.Target`.
diff --git a/lib/std/c.zig b/lib/std/c.zig
index e836a49c30..b4e5fc7392 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const page_size = std.mem.page_size;
diff --git a/lib/std/c/ast.zig b/lib/std/c/ast.zig
index 467050d57d..550ba52b84 100644
--- a/lib/std/c/ast.zig
+++ b/lib/std/c/ast.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const SegmentedList = std.SegmentedList;
 const Token = std.c.Token;
diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index 2426638569..411aeb8056 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const builtin = @import("builtin");
diff --git a/lib/std/c/dragonfly.zig b/lib/std/c/dragonfly.zig
index 0c859018be..2550cacc5b 100644
--- a/lib/std/c/dragonfly.zig
+++ b/lib/std/c/dragonfly.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 usingnamespace std.c;
 extern "c" threadlocal var errno: c_int;
diff --git a/lib/std/c/emscripten.zig b/lib/std/c/emscripten.zig
index e91e1421c7..e94a6f1004 100644
--- a/lib/std/c/emscripten.zig
+++ b/lib/std/c/emscripten.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(4) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
 };
diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index ea52c05f0b..1545a0e153 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 usingnamespace std.c;
 
diff --git a/lib/std/c/fuchsia.zig b/lib/std/c/fuchsia.zig
index 4f52b8900d..ceeb34a763 100644
--- a/lib/std/c/fuchsia.zig
+++ b/lib/std/c/fuchsia.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
 };
diff --git a/lib/std/c/haiku.zig b/lib/std/c/haiku.zig
index eb1e52a618..6b56e163c8 100644
--- a/lib/std/c/haiku.zig
+++ b/lib/std/c/haiku.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     flags: u32 = 0,
     lock: i32 = 0,
diff --git a/lib/std/c/hermit.zig b/lib/std/c/hermit.zig
index 1730aa43ac..6762e60962 100644
--- a/lib/std/c/hermit.zig
+++ b/lib/std/c/hermit.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     inner: usize = ~@as(usize, 0),
 };
diff --git a/lib/std/c/linux.zig b/lib/std/c/linux.zig
index b9f29b211d..538fbdfd7d 100644
--- a/lib/std/c/linux.zig
+++ b/lib/std/c/linux.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/c/minix.zig b/lib/std/c/minix.zig
index 98ec087a93..2bc1bac47a 100644
--- a/lib/std/c/minix.zig
+++ b/lib/std/c/minix.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index 31adbb1f59..0eb8e32bae 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 
diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 22963b08c3..8a6439fc83 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     inner: ?*c_void = null,
 };
diff --git a/lib/std/c/parse.zig b/lib/std/c/parse.zig
index 4c6c2fb462..d5b1a4a01e 100644
--- a/lib/std/c/parse.zig
+++ b/lib/std/c/parse.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const assert = std.debug.assert;
diff --git a/lib/std/c/solaris.zig b/lib/std/c/solaris.zig
index 7c70a01fc4..49ce0886f7 100644
--- a/lib/std/c/solaris.zig
+++ b/lib/std/c/solaris.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     __pthread_mutex_flag1: u16 = 0,
     __pthread_mutex_flag2: u8 = 0,
diff --git a/lib/std/c/tokenizer.zig b/lib/std/c/tokenizer.zig
index a3e6710e2f..9e9b5f4147 100644
--- a/lib/std/c/tokenizer.zig
+++ b/lib/std/c/tokenizer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/c/windows.zig b/lib/std/c/windows.zig
index 35ca217131..cd39324192 100644
--- a/lib/std/c/windows.zig
+++ b/lib/std/c/windows.zig
@@ -1 +1,6 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub extern "c" fn _errno() *c_int;
diff --git a/lib/std/cache_hash.zig b/lib/std/cache_hash.zig
index 79597a2663..58c9f444f3 100644
--- a/lib/std/cache_hash.zig
+++ b/lib/std/cache_hash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const Blake3 = std.crypto.Blake3;
 const fs = std.fs;
diff --git a/lib/std/child_process.zig b/lib/std/child_process.zig
index 5754cc2d53..3254b958b7 100644
--- a/lib/std/child_process.zig
+++ b/lib/std/child_process.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const cstr = std.cstr;
 const unicode = std.unicode;
diff --git a/lib/std/coff.zig b/lib/std/coff.zig
index 1ab88f6baf..cd567b3a6e 100644
--- a/lib/std/coff.zig
+++ b/lib/std/coff.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const io = std.io;
diff --git a/lib/std/comptime_string_map.zig b/lib/std/comptime_string_map.zig
index 8cc5cac130..ed647124a8 100644
--- a/lib/std/comptime_string_map.zig
+++ b/lib/std/comptime_string_map.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const mem = std.mem;
 
diff --git a/lib/std/crypto.zig b/lib/std/crypto.zig
index c1909a1823..edca2bc2ff 100644
--- a/lib/std/crypto.zig
+++ b/lib/std/crypto.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const Md5 = @import("crypto/md5.zig").Md5;
 pub const Sha1 = @import("crypto/sha1.zig").Sha1;
 
diff --git a/lib/std/crypto/25519/curve25519.zig b/lib/std/crypto/25519/curve25519.zig
index 46d7b9a3a6..94490f674c 100644
--- a/lib/std/crypto/25519/curve25519.zig
+++ b/lib/std/crypto/25519/curve25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 /// Group operations over Curve25519.
diff --git a/lib/std/crypto/25519/ed25519.zig b/lib/std/crypto/25519/ed25519.zig
index eb004d2607..935abaecb3 100644
--- a/lib/std/crypto/25519/ed25519.zig
+++ b/lib/std/crypto/25519/ed25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 const mem = std.mem;
diff --git a/lib/std/crypto/25519/edwards25519.zig b/lib/std/crypto/25519/edwards25519.zig
index 11f5963101..176e5337da 100644
--- a/lib/std/crypto/25519/edwards25519.zig
+++ b/lib/std/crypto/25519/edwards25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 
diff --git a/lib/std/crypto/25519/field.zig b/lib/std/crypto/25519/field.zig
index 85b8c68315..61929ba044 100644
--- a/lib/std/crypto/25519/field.zig
+++ b/lib/std/crypto/25519/field.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const readIntLittle = std.mem.readIntLittle;
 const writeIntLittle = std.mem.writeIntLittle;
diff --git a/lib/std/crypto/25519/ristretto255.zig b/lib/std/crypto/25519/ristretto255.zig
index a9636074a6..4e6494ed38 100644
--- a/lib/std/crypto/25519/ristretto255.zig
+++ b/lib/std/crypto/25519/ristretto255.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 
diff --git a/lib/std/crypto/25519/scalar.zig b/lib/std/crypto/25519/scalar.zig
index 3a3a29d4bc..2658126eeb 100644
--- a/lib/std/crypto/25519/scalar.zig
+++ b/lib/std/crypto/25519/scalar.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/crypto/25519/x25519.zig b/lib/std/crypto/25519/x25519.zig
index 4b5a8b8482..913140657d 100644
--- a/lib/std/crypto/25519/x25519.zig
+++ b/lib/std/crypto/25519/x25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const fmt = std.fmt;
diff --git a/lib/std/crypto/aes.zig b/lib/std/crypto/aes.zig
index 25070b3a44..2174fbdd4f 100644
--- a/lib/std/crypto/aes.zig
+++ b/lib/std/crypto/aes.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Based on Go stdlib implementation
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/benchmark.zig b/lib/std/crypto/benchmark.zig
index 267c2881b4..5c27f2f4f5 100644
--- a/lib/std/crypto/benchmark.zig
+++ b/lib/std/crypto/benchmark.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // zig run benchmark.zig --release-fast --override-lib-dir ..
 
 const builtin = @import("builtin");
diff --git a/lib/std/crypto/blake2.zig b/lib/std/crypto/blake2.zig
index ab44ca5298..9f5194994d 100644
--- a/lib/std/crypto/blake2.zig
+++ b/lib/std/crypto/blake2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const builtin = @import("builtin");
 const debug = @import("../debug.zig");
diff --git a/lib/std/crypto/blake3.zig b/lib/std/crypto/blake3.zig
index 08479d65a5..08986965fc 100644
--- a/lib/std/crypto/blake3.zig
+++ b/lib/std/crypto/blake3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Translated from BLAKE3 reference implementation.
 // Source: https://github.com/BLAKE3-team/BLAKE3
 
diff --git a/lib/std/crypto/chacha20.zig b/lib/std/crypto/chacha20.zig
index e51123eb81..d402eb6750 100644
--- a/lib/std/crypto/chacha20.zig
+++ b/lib/std/crypto/chacha20.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Based on public domain Supercop by Daniel J. Bernstein
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/gimli.zig b/lib/std/crypto/gimli.zig
index 6861c72a63..33afae5f82 100644
--- a/lib/std/crypto/gimli.zig
+++ b/lib/std/crypto/gimli.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Gimli is a 384-bit permutation designed to achieve high security with high
 // performance across a broad range of platforms, including 64-bit Intel/AMD
 // server CPUs, 64-bit and 32-bit ARM smartphone CPUs, 32-bit ARM
diff --git a/lib/std/crypto/hmac.zig b/lib/std/crypto/hmac.zig
index 69c1b86386..984dacc967 100644
--- a/lib/std/crypto/hmac.zig
+++ b/lib/std/crypto/hmac.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/md5.zig b/lib/std/crypto/md5.zig
index ac8948ca20..d578ba8b95 100644
--- a/lib/std/crypto/md5.zig
+++ b/lib/std/crypto/md5.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/poly1305.zig b/lib/std/crypto/poly1305.zig
index fda978307d..2ed97f4c2e 100644
--- a/lib/std/crypto/poly1305.zig
+++ b/lib/std/crypto/poly1305.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Translated from monocypher which is licensed under CC-0/BSD-3.
 //
 // https://monocypher.org/
diff --git a/lib/std/crypto/sha1.zig b/lib/std/crypto/sha1.zig
index 6edf7b745e..7cb4fbcf36 100644
--- a/lib/std/crypto/sha1.zig
+++ b/lib/std/crypto/sha1.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/sha2.zig b/lib/std/crypto/sha2.zig
index f004bceac3..cac18ca1f7 100644
--- a/lib/std/crypto/sha2.zig
+++ b/lib/std/crypto/sha2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/sha3.zig b/lib/std/crypto/sha3.zig
index 7c60674d75..03635ca553 100644
--- a/lib/std/crypto/sha3.zig
+++ b/lib/std/crypto/sha3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/test.zig b/lib/std/crypto/test.zig
index 61260c7e39..e4e34e543b 100644
--- a/lib/std/crypto/test.zig
+++ b/lib/std/crypto/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const mem = std.mem;
diff --git a/lib/std/cstr.zig b/lib/std/cstr.zig
index 9cb16b0ed3..4e11ad9201 100644
--- a/lib/std/cstr.zig
+++ b/lib/std/cstr.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index fb1c3a3a88..be57c0b2fd 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const math = std.math;
diff --git a/lib/std/debug/leb128.zig b/lib/std/debug/leb128.zig
index 7f43fdf494..eca777c1cf 100644
--- a/lib/std/debug/leb128.zig
+++ b/lib/std/debug/leb128.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const testing = std.testing;
 
diff --git a/lib/std/dwarf.zig b/lib/std/dwarf.zig
index 085e394a8f..37b76b1c14 100644
--- a/lib/std/dwarf.zig
+++ b/lib/std/dwarf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/dwarf_bits.zig b/lib/std/dwarf_bits.zig
index a40fa8a277..bf9c97154c 100644
--- a/lib/std/dwarf_bits.zig
+++ b/lib/std/dwarf_bits.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const TAG_padding = 0x00;
 pub const TAG_array_type = 0x01;
 pub const TAG_class_type = 0x02;
diff --git a/lib/std/dynamic_library.zig b/lib/std/dynamic_library.zig
index 65c65292bc..238854f07f 100644
--- a/lib/std/dynamic_library.zig
+++ b/lib/std/dynamic_library.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 const std = @import("std.zig");
diff --git a/lib/std/elf.zig b/lib/std/elf.zig
index a241ef9537..79303e7163 100644
--- a/lib/std/elf.zig
+++ b/lib/std/elf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/event.zig b/lib/std/event.zig
index d042e2ad9b..42f3176a1b 100644
--- a/lib/std/event.zig
+++ b/lib/std/event.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const Channel = @import("event/channel.zig").Channel;
 pub const Future = @import("event/future.zig").Future;
 pub const Group = @import("event/group.zig").Group;
diff --git a/lib/std/event/batch.zig b/lib/std/event/batch.zig
index 8f2954d85b..2ace2f7914 100644
--- a/lib/std/event/batch.zig
+++ b/lib/std/event/batch.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 
diff --git a/lib/std/event/channel.zig b/lib/std/event/channel.zig
index 5aef0bb3ba..de5b2c67ab 100644
--- a/lib/std/event/channel.zig
+++ b/lib/std/event/channel.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/event/future.zig b/lib/std/event/future.zig
index 5de22c574c..c9777288e4 100644
--- a/lib/std/event/future.zig
+++ b/lib/std/event/future.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/event/group.zig b/lib/std/event/group.zig
index 0dc6550218..e91adbbe8c 100644
--- a/lib/std/event/group.zig
+++ b/lib/std/event/group.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const Lock = std.event.Lock;
diff --git a/lib/std/event/lock.zig b/lib/std/event/lock.zig
index 179b881c9c..d27a12aef8 100644
--- a/lib/std/event/lock.zig
+++ b/lib/std/event/lock.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/event/locked.zig b/lib/std/event/locked.zig
index e921803447..9a53116fd6 100644
--- a/lib/std/event/locked.zig
+++ b/lib/std/event/locked.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const Lock = std.event.Lock;
 
diff --git a/lib/std/event/loop.zig b/lib/std/event/loop.zig
index 0abcad32e1..b34ad8c940 100644
--- a/lib/std/event/loop.zig
+++ b/lib/std/event/loop.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const root = @import("root");
diff --git a/lib/std/event/rwlock.zig b/lib/std/event/rwlock.zig
index 7a47c27dd8..3e3928d379 100644
--- a/lib/std/event/rwlock.zig
+++ b/lib/std/event/rwlock.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/event/rwlocked.zig b/lib/std/event/rwlocked.zig
index 9a569e8f1f..4fb25b59a1 100644
--- a/lib/std/event/rwlocked.zig
+++ b/lib/std/event/rwlocked.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const RwLock = std.event.RwLock;
 
diff --git a/lib/std/fifo.zig b/lib/std/fifo.zig
index 1edb413f47..c92da615f9 100644
--- a/lib/std/fifo.zig
+++ b/lib/std/fifo.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // FIFO of fixed size items
 // Usually used for e.g. byte buffers
 
diff --git a/lib/std/fmt.zig b/lib/std/fmt.zig
index 6dbef5db67..16d0eaa07a 100644
--- a/lib/std/fmt.zig
+++ b/lib/std/fmt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const math = std.math;
 const assert = std.debug.assert;
diff --git a/lib/std/fmt/errol.zig b/lib/std/fmt/errol.zig
index e697b7d42f..6a0a2256d8 100644
--- a/lib/std/fmt/errol.zig
+++ b/lib/std/fmt/errol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const enum3 = @import("errol/enum3.zig").enum3;
 const enum3_data = @import("errol/enum3.zig").enum3_data;
diff --git a/lib/std/fmt/errol/enum3.zig b/lib/std/fmt/errol/enum3.zig
index c27753483d..9dbe27c072 100644
--- a/lib/std/fmt/errol/enum3.zig
+++ b/lib/std/fmt/errol/enum3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const enum3 = [_]u64{
     0x4e2e2785c3a2a20b,
     0x240a28877a09a4e1,
diff --git a/lib/std/fmt/errol/lookup.zig b/lib/std/fmt/errol/lookup.zig
index 2fb6b167bb..85a4234bca 100644
--- a/lib/std/fmt/errol/lookup.zig
+++ b/lib/std/fmt/errol/lookup.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const HP = struct {
     val: f64,
     off: f64,
diff --git a/lib/std/fmt/parse_float.zig b/lib/std/fmt/parse_float.zig
index 2ab245043c..69557714f6 100644
--- a/lib/std/fmt/parse_float.zig
+++ b/lib/std/fmt/parse_float.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Adapted from https://github.com/grzegorz-kraszewski/stringtofloat.
 
 // MIT License
diff --git a/lib/std/fs.zig b/lib/std/fs.zig
index a492a43499..df368e070b 100644
--- a/lib/std/fs.zig
+++ b/lib/std/fs.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const os = std.os;
diff --git a/lib/std/fs/file.zig b/lib/std/fs/file.zig
index ce71571c9f..3e22528ea9 100644
--- a/lib/std/fs/file.zig
+++ b/lib/std/fs/file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const os = std.os;
diff --git a/lib/std/fs/get_app_data_dir.zig b/lib/std/fs/get_app_data_dir.zig
index c68232d0b5..17d365f684 100644
--- a/lib/std/fs/get_app_data_dir.zig
+++ b/lib/std/fs/get_app_data_dir.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const unicode = std.unicode;
diff --git a/lib/std/fs/path.zig b/lib/std/fs/path.zig
index 2176498feb..5e418e8e5c 100644
--- a/lib/std/fs/path.zig
+++ b/lib/std/fs/path.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 const debug = std.debug;
diff --git a/lib/std/fs/test.zig b/lib/std/fs/test.zig
index 9e6f4bb3ac..4be64ef225 100644
--- a/lib/std/fs/test.zig
+++ b/lib/std/fs/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const builtin = std.builtin;
diff --git a/lib/std/fs/wasi.zig b/lib/std/fs/wasi.zig
index 149ede252d..cad86e2314 100644
--- a/lib/std/fs/wasi.zig
+++ b/lib/std/fs/wasi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const os = std.os;
 const mem = std.mem;
diff --git a/lib/std/fs/watch.zig b/lib/std/fs/watch.zig
index 635818b702..269cdec6d8 100644
--- a/lib/std/fs/watch.zig
+++ b/lib/std/fs/watch.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const event = std.event;
diff --git a/lib/std/hash.zig b/lib/std/hash.zig
index c51353b328..1cc078959c 100644
--- a/lib/std/hash.zig
+++ b/lib/std/hash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const adler = @import("hash/adler.zig");
 pub const Adler32 = adler.Adler32;
 
diff --git a/lib/std/hash/adler.zig b/lib/std/hash/adler.zig
index 173a07596c..a3fc915f76 100644
--- a/lib/std/hash/adler.zig
+++ b/lib/std/hash/adler.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Adler32 checksum.
 //
 // https://tools.ietf.org/html/rfc1950#section-9
diff --git a/lib/std/hash/auto_hash.zig b/lib/std/hash/auto_hash.zig
index 996d6ede38..2905a6af13 100644
--- a/lib/std/hash/auto_hash.zig
+++ b/lib/std/hash/auto_hash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/hash/benchmark.zig b/lib/std/hash/benchmark.zig
index 5f8a15831c..c23743160b 100644
--- a/lib/std/hash/benchmark.zig
+++ b/lib/std/hash/benchmark.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // zig run benchmark.zig --release-fast --override-lib-dir ..
 
 const builtin = @import("builtin");
diff --git a/lib/std/hash/cityhash.zig b/lib/std/hash/cityhash.zig
index 73b94acbd2..38e62d88ef 100644
--- a/lib/std/hash/cityhash.zig
+++ b/lib/std/hash/cityhash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 
diff --git a/lib/std/hash/crc.zig b/lib/std/hash/crc.zig
index 506d8c8aed..37695df8b3 100644
--- a/lib/std/hash/crc.zig
+++ b/lib/std/hash/crc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // There are two implementations of CRC32 implemented with the following key characteristics:
 //
 // - Crc32WithPoly uses 8Kb of tables but is ~10x faster than the small method.
diff --git a/lib/std/hash/fnv.zig b/lib/std/hash/fnv.zig
index 8094134e19..81285be9a8 100644
--- a/lib/std/hash/fnv.zig
+++ b/lib/std/hash/fnv.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // FNV1a - Fowler-Noll-Vo hash function
 //
 // FNV1a is a fast, non-cryptographic hash function with fairly good distribution properties.
diff --git a/lib/std/hash/murmur.zig b/lib/std/hash/murmur.zig
index effa13ad69..d4204509c1 100644
--- a/lib/std/hash/murmur.zig
+++ b/lib/std/hash/murmur.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const testing = std.testing;
diff --git a/lib/std/hash/siphash.zig b/lib/std/hash/siphash.zig
index ebafdd6855..107ea19728 100644
--- a/lib/std/hash/siphash.zig
+++ b/lib/std/hash/siphash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Siphash
 //
 // SipHash is a moderately fast, non-cryptographic keyed hash function designed for resistance
diff --git a/lib/std/hash/wyhash.zig b/lib/std/hash/wyhash.zig
index ed2f03350c..12b400c38f 100644
--- a/lib/std/hash/wyhash.zig
+++ b/lib/std/hash/wyhash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/hash_map.zig b/lib/std/hash_map.zig
index d52a337422..8966737a0c 100644
--- a/lib/std/hash_map.zig
+++ b/lib/std/hash_map.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 4a2837d408..d6977f2f9c 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const root = @import("root");
 const debug = std.debug;
diff --git a/lib/std/heap/arena_allocator.zig b/lib/std/heap/arena_allocator.zig
index 191f0c19e9..e4bce8087f 100644
--- a/lib/std/heap/arena_allocator.zig
+++ b/lib/std/heap/arena_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/heap/general_purpose_allocator.zig b/lib/std/heap/general_purpose_allocator.zig
index cb53af113e..5d8de5845d 100644
--- a/lib/std/heap/general_purpose_allocator.zig
+++ b/lib/std/heap/general_purpose_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! # General Purpose Allocator
 //!
 //! ## Design Priorities
diff --git a/lib/std/heap/logging_allocator.zig b/lib/std/heap/logging_allocator.zig
index eff20a5c46..0e3e460b89 100644
--- a/lib/std/heap/logging_allocator.zig
+++ b/lib/std/heap/logging_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const Allocator = std.mem.Allocator;
 
diff --git a/lib/std/http.zig b/lib/std/http.zig
index acb005a75f..2b8495db71 100644
--- a/lib/std/http.zig
+++ b/lib/std/http.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 test "std.http" {
     _ = @import("http/headers.zig");
 }
diff --git a/lib/std/http/headers.zig b/lib/std/http/headers.zig
index 86aff5f364..8c80af512f 100644
--- a/lib/std/http/headers.zig
+++ b/lib/std/http/headers.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // HTTP Header data structure/type
 // Based on lua-http's http.header module
 //
diff --git a/lib/std/io.zig b/lib/std/io.zig
index 6d613b514a..e30ed1fa92 100644
--- a/lib/std/io.zig
+++ b/lib/std/io.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const root = @import("root");
diff --git a/lib/std/io/bit_in_stream.zig b/lib/std/io/bit_in_stream.zig
index 7759927e6d..a027deb802 100644
--- a/lib/std/io/bit_in_stream.zig
+++ b/lib/std/io/bit_in_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.bit_reader.BitReader`
 pub const BitInStream = @import("./bit_reader.zig").BitReader;
 
diff --git a/lib/std/io/bit_out_stream.zig b/lib/std/io/bit_out_stream.zig
index 20a3795d59..171fb542da 100644
--- a/lib/std/io/bit_out_stream.zig
+++ b/lib/std/io/bit_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.bit_writer.BitWriter`
 pub const BitOutStream = @import("./bit_writer.zig").BitWriter;
 
diff --git a/lib/std/io/bit_reader.zig b/lib/std/io/bit_reader.zig
index fbdf7fbe78..4ea2ed75a0 100644
--- a/lib/std/io/bit_reader.zig
+++ b/lib/std/io/bit_reader.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/bit_writer.zig b/lib/std/io/bit_writer.zig
index 7c1d3e5dba..de95e54404 100644
--- a/lib/std/io/bit_writer.zig
+++ b/lib/std/io/bit_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/buffered_atomic_file.zig b/lib/std/io/buffered_atomic_file.zig
index 3a3deb43bf..6284d4e44f 100644
--- a/lib/std/io/buffered_atomic_file.zig
+++ b/lib/std/io/buffered_atomic_file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const fs = std.fs;
diff --git a/lib/std/io/buffered_in_stream.zig b/lib/std/io/buffered_in_stream.zig
index 42ec0a5d6a..f055978152 100644
--- a/lib/std/io/buffered_in_stream.zig
+++ b/lib/std/io/buffered_in_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.buffered_reader.BufferedReader`
 pub const BufferedInStream = @import("./buffered_reader.zig").BufferedReader;
 
diff --git a/lib/std/io/buffered_out_stream.zig b/lib/std/io/buffered_out_stream.zig
index 6f9efa9575..5f1eaa6faf 100644
--- a/lib/std/io/buffered_out_stream.zig
+++ b/lib/std/io/buffered_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.buffered_writer.BufferedWriter`
 pub const BufferedOutStream = @import("./buffered_writer.zig").BufferedWriter;
 
diff --git a/lib/std/io/buffered_reader.zig b/lib/std/io/buffered_reader.zig
index 73d74b465f..58c4f3b4fc 100644
--- a/lib/std/io/buffered_reader.zig
+++ b/lib/std/io/buffered_reader.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const assert = std.debug.assert;
diff --git a/lib/std/io/buffered_writer.zig b/lib/std/io/buffered_writer.zig
index a970f899d6..bee3ff48af 100644
--- a/lib/std/io/buffered_writer.zig
+++ b/lib/std/io/buffered_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 
diff --git a/lib/std/io/c_out_stream.zig b/lib/std/io/c_out_stream.zig
index e10795ae0a..69f4d9f5af 100644
--- a/lib/std/io/c_out_stream.zig
+++ b/lib/std/io/c_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.c_writer.CWriter`
 pub const COutStream = @import("./c_writer.zig").CWriter;
 
diff --git a/lib/std/io/c_writer.zig b/lib/std/io/c_writer.zig
index 6292450223..9fd10d827e 100644
--- a/lib/std/io/c_writer.zig
+++ b/lib/std/io/c_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/counting_out_stream.zig b/lib/std/io/counting_out_stream.zig
index 5b0b35b4c5..fecdf8adb0 100644
--- a/lib/std/io/counting_out_stream.zig
+++ b/lib/std/io/counting_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.counting_writer.CountingWriter`
 pub const CountingOutStream = @import("./counting_writer.zig").CountingWriter;
 
diff --git a/lib/std/io/counting_writer.zig b/lib/std/io/counting_writer.zig
index c0cd53c7ee..aefd459b90 100644
--- a/lib/std/io/counting_writer.zig
+++ b/lib/std/io/counting_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/fixed_buffer_stream.zig b/lib/std/io/fixed_buffer_stream.zig
index 32625f3b7a..b1d2aaf89a 100644
--- a/lib/std/io/fixed_buffer_stream.zig
+++ b/lib/std/io/fixed_buffer_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/in_stream.zig b/lib/std/io/in_stream.zig
index c58f5d7b77..4583591d42 100644
--- a/lib/std/io/in_stream.zig
+++ b/lib/std/io/in_stream.zig
@@ -1,2 +1,7 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.reader.Reader`
 pub const InStream = @import("./reader.zig").Reader;
diff --git a/lib/std/io/multi_out_stream.zig b/lib/std/io/multi_out_stream.zig
index fa7a60de51..7b96cc3d15 100644
--- a/lib/std/io/multi_out_stream.zig
+++ b/lib/std/io/multi_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.multi_writer.MultiWriter`
 pub const MultiOutStream = @import("./multi_writer.zig").MultiWriter;
 
diff --git a/lib/std/io/multi_writer.zig b/lib/std/io/multi_writer.zig
index e63940bff7..7ee43eddeb 100644
--- a/lib/std/io/multi_writer.zig
+++ b/lib/std/io/multi_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/out_stream.zig b/lib/std/io/out_stream.zig
index a3fe3e32b5..c937ccf16a 100644
--- a/lib/std/io/out_stream.zig
+++ b/lib/std/io/out_stream.zig
@@ -1,2 +1,7 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.writer.Writer`
 pub const OutStream = @import("./writer.zig").Writer;
diff --git a/lib/std/io/peek_stream.zig b/lib/std/io/peek_stream.zig
index 08e940c6ec..82554d05ca 100644
--- a/lib/std/io/peek_stream.zig
+++ b/lib/std/io/peek_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const mem = std.mem;
diff --git a/lib/std/io/reader.zig b/lib/std/io/reader.zig
index 4c682e8aba..07327a431d 100644
--- a/lib/std/io/reader.zig
+++ b/lib/std/io/reader.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const math = std.math;
diff --git a/lib/std/io/seekable_stream.zig b/lib/std/io/seekable_stream.zig
index 1aa653dbe5..15e537baa2 100644
--- a/lib/std/io/seekable_stream.zig
+++ b/lib/std/io/seekable_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 
 pub fn SeekableStream(
diff --git a/lib/std/io/serialization.zig b/lib/std/io/serialization.zig
index 317dde6417..4f8c149b47 100644
--- a/lib/std/io/serialization.zig
+++ b/lib/std/io/serialization.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/stream_source.zig b/lib/std/io/stream_source.zig
index 63d9ea9f2e..3bfe0d2e64 100644
--- a/lib/std/io/stream_source.zig
+++ b/lib/std/io/stream_source.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/test.zig b/lib/std/io/test.zig
index 779f52a2aa..ecad26a448 100644
--- a/lib/std/io/test.zig
+++ b/lib/std/io/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/writer.zig b/lib/std/io/writer.zig
index a98e3b1acd..39729ef0a2 100644
--- a/lib/std/io/writer.zig
+++ b/lib/std/io/writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const mem = std.mem;
diff --git a/lib/std/json.zig b/lib/std/json.zig
index 59c765ac42..2f8a70d0ef 100644
--- a/lib/std/json.zig
+++ b/lib/std/json.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // JSON parser conforming to RFC8259.
 //
 // https://tools.ietf.org/html/rfc8259
diff --git a/lib/std/json/test.zig b/lib/std/json/test.zig
index ed7454cce3..3a7c25e383 100644
--- a/lib/std/json/test.zig
+++ b/lib/std/json/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // RFC 8529 conformance tests.
 //
 // Tests are taken from https://github.com/nst/JSONTestSuite
diff --git a/lib/std/json/write_stream.zig b/lib/std/json/write_stream.zig
index 778173cc24..59bebd69d3 100644
--- a/lib/std/json/write_stream.zig
+++ b/lib/std/json/write_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/linked_list.zig b/lib/std/linked_list.zig
index 39f52021b2..e99f3d8725 100644
--- a/lib/std/linked_list.zig
+++ b/lib/std/linked_list.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/log.zig b/lib/std/log.zig
index 8d5554aa46..50bdfdc068 100644
--- a/lib/std/log.zig
+++ b/lib/std/log.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const root = @import("root");
diff --git a/lib/std/macho.zig b/lib/std/macho.zig
index 950283b59f..99a8cd776c 100644
--- a/lib/std/macho.zig
+++ b/lib/std/macho.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const mach_header = extern struct {
     magic: u32,
     cputype: cpu_type_t,
diff --git a/lib/std/math.zig b/lib/std/math.zig
index 2c9065a89e..a76f0a391d 100644
--- a/lib/std/math.zig
+++ b/lib/std/math.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/math/acos.zig b/lib/std/math/acos.zig
index cdd86601fd..f085680176 100644
--- a/lib/std/math/acos.zig
+++ b/lib/std/math/acos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/acosh.zig b/lib/std/math/acosh.zig
index 9a594f9cc4..76d6edff3e 100644
--- a/lib/std/math/acosh.zig
+++ b/lib/std/math/acosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/asin.zig b/lib/std/math/asin.zig
index 4cff69fc1b..a4a19c74d9 100644
--- a/lib/std/math/asin.zig
+++ b/lib/std/math/asin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/asinh.zig b/lib/std/math/asinh.zig
index 940b953d06..dc97ac3082 100644
--- a/lib/std/math/asinh.zig
+++ b/lib/std/math/asinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atan.zig b/lib/std/math/atan.zig
index 9342b6ed59..390e10b3c4 100644
--- a/lib/std/math/atan.zig
+++ b/lib/std/math/atan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atan2.zig b/lib/std/math/atan2.zig
index 68e381607d..6540eced84 100644
--- a/lib/std/math/atan2.zig
+++ b/lib/std/math/atan2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atanh.zig b/lib/std/math/atanh.zig
index de742bd4cd..abd573bb1a 100644
--- a/lib/std/math/atanh.zig
+++ b/lib/std/math/atanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/big.zig b/lib/std/math/big.zig
index ab651c05c6..6246a4fb8b 100644
--- a/lib/std/math/big.zig
+++ b/lib/std/math/big.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 
diff --git a/lib/std/math/big/int.zig b/lib/std/math/big/int.zig
index 92b3f80429..adb5848931 100644
--- a/lib/std/math/big/int.zig
+++ b/lib/std/math/big/int.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const math = std.math;
 const Limb = std.math.big.Limb;
diff --git a/lib/std/math/big/int_test.zig b/lib/std/math/big/int_test.zig
index a86b55d2de..5931767a82 100644
--- a/lib/std/math/big/int_test.zig
+++ b/lib/std/math/big/int_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const mem = std.mem;
 const testing = std.testing;
diff --git a/lib/std/math/big/rational.zig b/lib/std/math/big/rational.zig
index 6f62a462b8..e83139cf37 100644
--- a/lib/std/math/big/rational.zig
+++ b/lib/std/math/big/rational.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const debug = std.debug;
 const math = std.math;
diff --git a/lib/std/math/cbrt.zig b/lib/std/math/cbrt.zig
index 42163b96dc..0d097a0c75 100644
--- a/lib/std/math/cbrt.zig
+++ b/lib/std/math/cbrt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/ceil.zig b/lib/std/math/ceil.zig
index 39de46f361..ac04c9a8cc 100644
--- a/lib/std/math/ceil.zig
+++ b/lib/std/math/ceil.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex.zig b/lib/std/math/complex.zig
index 8bff2313fc..ec76f425eb 100644
--- a/lib/std/math/complex.zig
+++ b/lib/std/math/complex.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/abs.zig b/lib/std/math/complex/abs.zig
index db31aef42a..db9c43e89d 100644
--- a/lib/std/math/complex/abs.zig
+++ b/lib/std/math/complex/abs.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/acos.zig b/lib/std/math/complex/acos.zig
index 072fd77f08..1372c280e2 100644
--- a/lib/std/math/complex/acos.zig
+++ b/lib/std/math/complex/acos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/acosh.zig b/lib/std/math/complex/acosh.zig
index 59117a8b27..49d9fd0302 100644
--- a/lib/std/math/complex/acosh.zig
+++ b/lib/std/math/complex/acosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/arg.zig b/lib/std/math/complex/arg.zig
index 6cf959a081..7cfbc8bd0f 100644
--- a/lib/std/math/complex/arg.zig
+++ b/lib/std/math/complex/arg.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/asin.zig b/lib/std/math/complex/asin.zig
index 9f7cd396aa..5c5de3ff4f 100644
--- a/lib/std/math/complex/asin.zig
+++ b/lib/std/math/complex/asin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/asinh.zig b/lib/std/math/complex/asinh.zig
index 0c3c2bd115..a3f5f04fbc 100644
--- a/lib/std/math/complex/asinh.zig
+++ b/lib/std/math/complex/asinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/atan.zig b/lib/std/math/complex/atan.zig
index 98bde3e125..e5c49976ac 100644
--- a/lib/std/math/complex/atan.zig
+++ b/lib/std/math/complex/atan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/atanh.zig b/lib/std/math/complex/atanh.zig
index a07c2969e4..4ab2410258 100644
--- a/lib/std/math/complex/atanh.zig
+++ b/lib/std/math/complex/atanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/conj.zig b/lib/std/math/complex/conj.zig
index 42a34e7dfc..159469da86 100644
--- a/lib/std/math/complex/conj.zig
+++ b/lib/std/math/complex/conj.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/cos.zig b/lib/std/math/complex/cos.zig
index 9daf89c730..559613cc34 100644
--- a/lib/std/math/complex/cos.zig
+++ b/lib/std/math/complex/cos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/cosh.zig b/lib/std/math/complex/cosh.zig
index bd51629bd4..f668cb60ce 100644
--- a/lib/std/math/complex/cosh.zig
+++ b/lib/std/math/complex/cosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/exp.zig b/lib/std/math/complex/exp.zig
index 6f6061a947..3ad51fe06f 100644
--- a/lib/std/math/complex/exp.zig
+++ b/lib/std/math/complex/exp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/ldexp.zig b/lib/std/math/complex/ldexp.zig
index c23b9b346e..b1cf8a0e42 100644
--- a/lib/std/math/complex/ldexp.zig
+++ b/lib/std/math/complex/ldexp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/log.zig b/lib/std/math/complex/log.zig
index ec02c6c325..cb719f4b31 100644
--- a/lib/std/math/complex/log.zig
+++ b/lib/std/math/complex/log.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/pow.zig b/lib/std/math/complex/pow.zig
index a2480453fc..7be38cadf2 100644
--- a/lib/std/math/complex/pow.zig
+++ b/lib/std/math/complex/pow.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/proj.zig b/lib/std/math/complex/proj.zig
index e208ae0370..67f087f8ba 100644
--- a/lib/std/math/complex/proj.zig
+++ b/lib/std/math/complex/proj.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/sin.zig b/lib/std/math/complex/sin.zig
index 1b10f8fca6..2f33e13354 100644
--- a/lib/std/math/complex/sin.zig
+++ b/lib/std/math/complex/sin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/sinh.zig b/lib/std/math/complex/sinh.zig
index 32f2a730fb..3242adef79 100644
--- a/lib/std/math/complex/sinh.zig
+++ b/lib/std/math/complex/sinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/sqrt.zig b/lib/std/math/complex/sqrt.zig
index 0edb02a7a9..8abb9a6064 100644
--- a/lib/std/math/complex/sqrt.zig
+++ b/lib/std/math/complex/sqrt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/tan.zig b/lib/std/math/complex/tan.zig
index 050898c573..adcda786c1 100644
--- a/lib/std/math/complex/tan.zig
+++ b/lib/std/math/complex/tan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/tanh.zig b/lib/std/math/complex/tanh.zig
index 1d614cca58..fd63114982 100644
--- a/lib/std/math/complex/tanh.zig
+++ b/lib/std/math/complex/tanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/copysign.zig b/lib/std/math/copysign.zig
index e874da0bb9..1547382cbd 100644
--- a/lib/std/math/copysign.zig
+++ b/lib/std/math/copysign.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/cos.zig b/lib/std/math/cos.zig
index df5c0a53be..3d282c82e1 100644
--- a/lib/std/math/cos.zig
+++ b/lib/std/math/cos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/cosh.zig b/lib/std/math/cosh.zig
index bab47dcdbd..221ebcf089 100644
--- a/lib/std/math/cosh.zig
+++ b/lib/std/math/cosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/exp.zig b/lib/std/math/exp.zig
index c84d929adf..36d18f83b2 100644
--- a/lib/std/math/exp.zig
+++ b/lib/std/math/exp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/exp2.zig b/lib/std/math/exp2.zig
index da391189b2..b97690948e 100644
--- a/lib/std/math/exp2.zig
+++ b/lib/std/math/exp2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/expm1.zig b/lib/std/math/expm1.zig
index 80cdefae20..98e66b17d5 100644
--- a/lib/std/math/expm1.zig
+++ b/lib/std/math/expm1.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/expo2.zig b/lib/std/math/expo2.zig
index f404570fb6..a81c9920e0 100644
--- a/lib/std/math/expo2.zig
+++ b/lib/std/math/expo2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/fabs.zig b/lib/std/math/fabs.zig
index ca91f594fd..f263bfbc58 100644
--- a/lib/std/math/fabs.zig
+++ b/lib/std/math/fabs.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/floor.zig b/lib/std/math/floor.zig
index 3a71cc7cdf..7b61980a5e 100644
--- a/lib/std/math/floor.zig
+++ b/lib/std/math/floor.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/fma.zig b/lib/std/math/fma.zig
index 014593cda5..6993fc9786 100644
--- a/lib/std/math/fma.zig
+++ b/lib/std/math/fma.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/frexp.zig b/lib/std/math/frexp.zig
index 0e4558dc37..2d99c85c51 100644
--- a/lib/std/math/frexp.zig
+++ b/lib/std/math/frexp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/hypot.zig b/lib/std/math/hypot.zig
index 59116014b3..595563076b 100644
--- a/lib/std/math/hypot.zig
+++ b/lib/std/math/hypot.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/ilogb.zig b/lib/std/math/ilogb.zig
index 748cf9ea0d..a6fb031973 100644
--- a/lib/std/math/ilogb.zig
+++ b/lib/std/math/ilogb.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/inf.zig b/lib/std/math/inf.zig
index 86ff245533..f2e0283e03 100644
--- a/lib/std/math/inf.zig
+++ b/lib/std/math/inf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 
diff --git a/lib/std/math/isfinite.zig b/lib/std/math/isfinite.zig
index 0681eae0b7..938c495d65 100644
--- a/lib/std/math/isfinite.zig
+++ b/lib/std/math/isfinite.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isinf.zig b/lib/std/math/isinf.zig
index 19357d89d1..2ecd9c2b9c 100644
--- a/lib/std/math/isinf.zig
+++ b/lib/std/math/isinf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isnan.zig b/lib/std/math/isnan.zig
index 797c115d1d..fc58e7334c 100644
--- a/lib/std/math/isnan.zig
+++ b/lib/std/math/isnan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isnormal.zig b/lib/std/math/isnormal.zig
index a3144f2784..b9ff515bdc 100644
--- a/lib/std/math/isnormal.zig
+++ b/lib/std/math/isnormal.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/ln.zig b/lib/std/math/ln.zig
index 99e54c4cc7..60a2f528aa 100644
--- a/lib/std/math/ln.zig
+++ b/lib/std/math/ln.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log.zig b/lib/std/math/log.zig
index 6f5025cd50..4286b74960 100644
--- a/lib/std/math/log.zig
+++ b/lib/std/math/log.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log10.zig b/lib/std/math/log10.zig
index e55bd8c1e8..d7d192a564 100644
--- a/lib/std/math/log10.zig
+++ b/lib/std/math/log10.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log1p.zig b/lib/std/math/log1p.zig
index e24ba8d84d..5a87e92313 100644
--- a/lib/std/math/log1p.zig
+++ b/lib/std/math/log1p.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log2.zig b/lib/std/math/log2.zig
index 95d06a2b60..2b9fbe3d84 100644
--- a/lib/std/math/log2.zig
+++ b/lib/std/math/log2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/modf.zig b/lib/std/math/modf.zig
index 5ab5318a79..830b99257e 100644
--- a/lib/std/math/modf.zig
+++ b/lib/std/math/modf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/nan.zig b/lib/std/math/nan.zig
index 5a01a5b3bd..b8e3b517e2 100644
--- a/lib/std/math/nan.zig
+++ b/lib/std/math/nan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const math = @import("../math.zig");
 
 /// Returns the nan representation for type T.
diff --git a/lib/std/math/pow.zig b/lib/std/math/pow.zig
index cb39dd59e3..30b52acbda 100644
--- a/lib/std/math/pow.zig
+++ b/lib/std/math/pow.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/powi.zig b/lib/std/math/powi.zig
index ce3a3713e3..660aeddc05 100644
--- a/lib/std/math/powi.zig
+++ b/lib/std/math/powi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Based on Rust, which is licensed under the MIT license.
 // https://github.com/rust-lang/rust/blob/360432f1e8794de58cd94f34c9c17ad65871e5b5/LICENSE-MIT
 //
diff --git a/lib/std/math/round.zig b/lib/std/math/round.zig
index 854adee4ba..7798e6157a 100644
--- a/lib/std/math/round.zig
+++ b/lib/std/math/round.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/scalbn.zig b/lib/std/math/scalbn.zig
index 71a8110ce7..7243084dd4 100644
--- a/lib/std/math/scalbn.zig
+++ b/lib/std/math/scalbn.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/signbit.zig b/lib/std/math/signbit.zig
index 49397f7bd4..defd02aa3a 100644
--- a/lib/std/math/signbit.zig
+++ b/lib/std/math/signbit.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/sin.zig b/lib/std/math/sin.zig
index df3b294ca6..c7db4f8623 100644
--- a/lib/std/math/sin.zig
+++ b/lib/std/math/sin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/sinh.zig b/lib/std/math/sinh.zig
index 26e0e05f38..1246c89cc0 100644
--- a/lib/std/math/sinh.zig
+++ b/lib/std/math/sinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/sqrt.zig b/lib/std/math/sqrt.zig
index 2f0d251432..34851ca647 100644
--- a/lib/std/math/sqrt.zig
+++ b/lib/std/math/sqrt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/tan.zig b/lib/std/math/tan.zig
index 2cd5a407df..5e5a80e15d 100644
--- a/lib/std/math/tan.zig
+++ b/lib/std/math/tan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/tanh.zig b/lib/std/math/tanh.zig
index 7697db5271..3abc5d4d75 100644
--- a/lib/std/math/tanh.zig
+++ b/lib/std/math/tanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/trunc.zig b/lib/std/math/trunc.zig
index df24b77111..85bc68f226 100644
--- a/lib/std/math/trunc.zig
+++ b/lib/std/math/trunc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index 1ba64f47fa..33977e3ce3 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/mem/Allocator.zig b/lib/std/mem/Allocator.zig
index e73050165e..bb59de2a7e 100644
--- a/lib/std/mem/Allocator.zig
+++ b/lib/std/mem/Allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! The standard memory allocation interface.
 
 const std = @import("../std.zig");
diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index 6340a44fae..aaa8e7ca78 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/meta/trailer_flags.zig b/lib/std/meta/trailer_flags.zig
index 0da7ca815a..6e1d8bea32 100644
--- a/lib/std/meta/trailer_flags.zig
+++ b/lib/std/meta/trailer_flags.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const meta = std.meta;
 const testing = std.testing;
diff --git a/lib/std/meta/trait.zig b/lib/std/meta/trait.zig
index f04d6353c6..2455542e4f 100644
--- a/lib/std/meta/trait.zig
+++ b/lib/std/meta/trait.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const mem = std.mem;
diff --git a/lib/std/mutex.zig b/lib/std/mutex.zig
index 3361a42e21..706685d1fa 100644
--- a/lib/std/mutex.zig
+++ b/lib/std/mutex.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const os = std.os;
diff --git a/lib/std/net.zig b/lib/std/net.zig
index 0cd34376e1..10e5b371f8 100644
--- a/lib/std/net.zig
+++ b/lib/std/net.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/net/test.zig b/lib/std/net/test.zig
index 89b84ac83d..815ee81d7f 100644
--- a/lib/std/net/test.zig
+++ b/lib/std/net/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const net = std.net;
diff --git a/lib/std/once.zig b/lib/std/once.zig
index cf42d021a2..6e0e4867d8 100644
--- a/lib/std/once.zig
+++ b/lib/std/once.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const testing = std.testing;
diff --git a/lib/std/os.zig b/lib/std/os.zig
index 6f58d7f077..e8431c386b 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file contains thin wrappers around OS-specific APIs, with these
 // specific goals in mind:
 // * Convert "errno"-style error codes into Zig errors.
diff --git a/lib/std/os/bits.zig b/lib/std/os/bits.zig
index 38f019d775..177b7daad2 100644
--- a/lib/std/os/bits.zig
+++ b/lib/std/os/bits.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! Platform-dependent types and values that are used along with OS-specific APIs.
 //! These are imported into `std.c`, `std.os`, and `std.os.linux`.
 //! Root source files can define `os.bits` and these will additionally be added
diff --git a/lib/std/os/bits/darwin.zig b/lib/std/os/bits/darwin.zig
index 4581490e6f..375127f278 100644
--- a/lib/std/os/bits/darwin.zig
+++ b/lib/std/os/bits/darwin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/dragonfly.zig b/lib/std/os/bits/dragonfly.zig
index df22678323..8b6d6be212 100644
--- a/lib/std/os/bits/dragonfly.zig
+++ b/lib/std/os/bits/dragonfly.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
diff --git a/lib/std/os/bits/freebsd.zig b/lib/std/os/bits/freebsd.zig
index 3622fb7641..22edf4b9d1 100644
--- a/lib/std/os/bits/freebsd.zig
+++ b/lib/std/os/bits/freebsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
diff --git a/lib/std/os/bits/linux.zig b/lib/std/os/bits/linux.zig
index 4ad1fc7de4..4fa8a02d3d 100644
--- a/lib/std/os/bits/linux.zig
+++ b/lib/std/os/bits/linux.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/linux/arm-eabi.zig b/lib/std/os/bits/linux/arm-eabi.zig
index b32d3ef9d4..36f1f4f442 100644
--- a/lib/std/os/bits/linux/arm-eabi.zig
+++ b/lib/std/os/bits/linux/arm-eabi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // arm-eabi-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
diff --git a/lib/std/os/bits/linux/arm64.zig b/lib/std/os/bits/linux/arm64.zig
index 0745f19fb0..6ecbcc9ae1 100644
--- a/lib/std/os/bits/linux/arm64.zig
+++ b/lib/std/os/bits/linux/arm64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // arm64-specific declarations that are intended to be imported into the POSIX namespace.
 // This does include Linux-only APIs.
 
diff --git a/lib/std/os/bits/linux/bpf.zig b/lib/std/os/bits/linux/bpf.zig
index 150d3e9135..e86e082ff7 100644
--- a/lib/std/os/bits/linux/bpf.zig
+++ b/lib/std/os/bits/linux/bpf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace std.os;
 const std = @import("../../../std.zig");
 
diff --git a/lib/std/os/bits/linux/errno-generic.zig b/lib/std/os/bits/linux/errno-generic.zig
index 53af9cc5e5..a99f20a1a8 100644
--- a/lib/std/os/bits/linux/errno-generic.zig
+++ b/lib/std/os/bits/linux/errno-generic.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Operation not permitted
 pub const EPERM = 1;
 
diff --git a/lib/std/os/bits/linux/errno-mips.zig b/lib/std/os/bits/linux/errno-mips.zig
index 81cbde4af4..1258863086 100644
--- a/lib/std/os/bits/linux/errno-mips.zig
+++ b/lib/std/os/bits/linux/errno-mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const EPERM = 1;
 pub const ENOENT = 2;
 pub const ESRCH = 3;
diff --git a/lib/std/os/bits/linux/i386.zig b/lib/std/os/bits/linux/i386.zig
index 868e4f537b..a560c14613 100644
--- a/lib/std/os/bits/linux/i386.zig
+++ b/lib/std/os/bits/linux/i386.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // i386-specific declarations that are intended to be imported into the POSIX namespace.
 // This does include Linux-only APIs.
 
diff --git a/lib/std/os/bits/linux/mips.zig b/lib/std/os/bits/linux/mips.zig
index 5946e821ad..4b81c6e622 100644
--- a/lib/std/os/bits/linux/mips.zig
+++ b/lib/std/os/bits/linux/mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
 const socklen_t = linux.socklen_t;
diff --git a/lib/std/os/bits/linux/netlink.zig b/lib/std/os/bits/linux/netlink.zig
index f3d000e785..3e75733b9a 100644
--- a/lib/std/os/bits/linux/netlink.zig
+++ b/lib/std/os/bits/linux/netlink.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../linux.zig");
 
 /// Routing/device hook
diff --git a/lib/std/os/bits/linux/riscv64.zig b/lib/std/os/bits/linux/riscv64.zig
index 220e673622..c4b0f044f2 100644
--- a/lib/std/os/bits/linux/riscv64.zig
+++ b/lib/std/os/bits/linux/riscv64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // riscv64-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const uid_t = std.os.linux.uid_t;
diff --git a/lib/std/os/bits/linux/x86_64.zig b/lib/std/os/bits/linux/x86_64.zig
index c87bca6f8e..0800feeddf 100644
--- a/lib/std/os/bits/linux/x86_64.zig
+++ b/lib/std/os/bits/linux/x86_64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // x86-64-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const pid_t = linux.pid_t;
diff --git a/lib/std/os/bits/netbsd.zig b/lib/std/os/bits/netbsd.zig
index 91e101620f..d628bf4566 100644
--- a/lib/std/os/bits/netbsd.zig
+++ b/lib/std/os/bits/netbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = std.builtin;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/wasi.zig b/lib/std/os/bits/wasi.zig
index 270345c53b..f768b5522b 100644
--- a/lib/std/os/bits/wasi.zig
+++ b/lib/std/os/bits/wasi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Convenience types and consts used by std.os module
 pub const STDIN_FILENO = 0;
 pub const STDOUT_FILENO = 1;
diff --git a/lib/std/os/bits/windows.zig b/lib/std/os/bits/windows.zig
index 5316a048cc..836d273c1c 100644
--- a/lib/std/os/bits/windows.zig
+++ b/lib/std/os/bits/windows.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // The reference for these types and values is Microsoft Windows's ucrt (Universal C RunTime).
 
 usingnamespace @import("../windows/bits.zig");
diff --git a/lib/std/os/darwin.zig b/lib/std/os/darwin.zig
index d3e9cefb86..1bd983398b 100644
--- a/lib/std/os/darwin.zig
+++ b/lib/std/os/darwin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 pub usingnamespace std.c;
diff --git a/lib/std/os/dragonfly.zig b/lib/std/os/dragonfly.zig
index 5f9684b96d..a713a009ad 100644
--- a/lib/std/os/dragonfly.zig
+++ b/lib/std/os/dragonfly.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/freebsd.zig b/lib/std/os/freebsd.zig
index 5f9684b96d..a713a009ad 100644
--- a/lib/std/os/freebsd.zig
+++ b/lib/std/os/freebsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 7fe0ba00ae..ae66e619c3 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file provides the system interface functions for Linux matching those
 // that are provided by libc, whether or not libc is linked. The following
 // abstractions are made:
diff --git a/lib/std/os/linux/arm-eabi.zig b/lib/std/os/linux/arm-eabi.zig
index 352afeeb04..a72799a26a 100644
--- a/lib/std/os/linux/arm-eabi.zig
+++ b/lib/std/os/linux/arm-eabi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/arm64.zig b/lib/std/os/linux/arm64.zig
index 49548522ec..6727cbce8e 100644
--- a/lib/std/os/linux/arm64.zig
+++ b/lib/std/os/linux/arm64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/i386.zig b/lib/std/os/linux/i386.zig
index a4fdf8a346..ed5bc88f0f 100644
--- a/lib/std/os/linux/i386.zig
+++ b/lib/std/os/linux/i386.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/mips.zig b/lib/std/os/linux/mips.zig
index 5b5c1e1f34..ad673e06f9 100644
--- a/lib/std/os/linux/mips.zig
+++ b/lib/std/os/linux/mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/riscv64.zig b/lib/std/os/linux/riscv64.zig
index 39cc13f5b6..034340d0b3 100644
--- a/lib/std/os/linux/riscv64.zig
+++ b/lib/std/os/linux/riscv64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/test.zig b/lib/std/os/linux/test.zig
index aa6655b7d8..7599cfc395 100644
--- a/lib/std/os/linux/test.zig
+++ b/lib/std/os/linux/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = @import("builtin");
 const linux = std.os.linux;
diff --git a/lib/std/os/linux/tls.zig b/lib/std/os/linux/tls.zig
index 8cba45d4b3..b10dae14d7 100644
--- a/lib/std/os/linux/tls.zig
+++ b/lib/std/os/linux/tls.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/os/linux/vdso.zig b/lib/std/os/linux/vdso.zig
index 27c56d6c42..776737d928 100644
--- a/lib/std/os/linux/vdso.zig
+++ b/lib/std/os/linux/vdso.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const elf = std.elf;
 const linux = std.os.linux;
diff --git a/lib/std/os/linux/x86_64.zig b/lib/std/os/linux/x86_64.zig
index 33d2b66670..8987e1aab3 100644
--- a/lib/std/os/linux/x86_64.zig
+++ b/lib/std/os/linux/x86_64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/netbsd.zig b/lib/std/os/netbsd.zig
index 5f9684b96d..a713a009ad 100644
--- a/lib/std/os/netbsd.zig
+++ b/lib/std/os/netbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/test.zig b/lib/std/os/test.zig
index dc8a89c688..93c4ee0403 100644
--- a/lib/std/os/test.zig
+++ b/lib/std/os/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const os = std.os;
 const testing = std.testing;
diff --git a/lib/std/os/uefi.zig b/lib/std/os/uefi.zig
index c037075cd8..0127033db2 100644
--- a/lib/std/os/uefi.zig
+++ b/lib/std/os/uefi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// A protocol is an interface identified by a GUID.
 pub const protocols = @import("uefi/protocols.zig");
 
diff --git a/lib/std/os/uefi/protocols.zig b/lib/std/os/uefi/protocols.zig
index 353c628a05..1519092b84 100644
--- a/lib/std/os/uefi/protocols.zig
+++ b/lib/std/os/uefi/protocols.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const LoadedImageProtocol = @import("protocols/loaded_image_protocol.zig").LoadedImageProtocol;
 pub const loaded_image_device_path_protocol_guid = @import("protocols/loaded_image_protocol.zig").loaded_image_device_path_protocol_guid;
 
diff --git a/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig b/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
index a06a19c1a4..3ec6aab5b9 100644
--- a/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
+++ b/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/device_path_protocol.zig b/lib/std/os/uefi/protocols/device_path_protocol.zig
index f359484eb9..1a998f0f78 100644
--- a/lib/std/os/uefi/protocols/device_path_protocol.zig
+++ b/lib/std/os/uefi/protocols/device_path_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_active_protocol.zig b/lib/std/os/uefi/protocols/edid_active_protocol.zig
index fcdef78d83..dc8057b4f8 100644
--- a/lib/std/os/uefi/protocols/edid_active_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_active_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_discovered_protocol.zig b/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
index 00b59cb6c8..1ed2b6277d 100644
--- a/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_override_protocol.zig b/lib/std/os/uefi/protocols/edid_override_protocol.zig
index efe73982e9..83260f7b88 100644
--- a/lib/std/os/uefi/protocols/edid_override_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_override_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Handle = uefi.Handle;
diff --git a/lib/std/os/uefi/protocols/file_protocol.zig b/lib/std/os/uefi/protocols/file_protocol.zig
index eacd777008..ce34a2d6e5 100644
--- a/lib/std/os/uefi/protocols/file_protocol.zig
+++ b/lib/std/os/uefi/protocols/file_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Time = uefi.Time;
diff --git a/lib/std/os/uefi/protocols/graphics_output_protocol.zig b/lib/std/os/uefi/protocols/graphics_output_protocol.zig
index 1ceccce0bf..3ec1c39ab8 100644
--- a/lib/std/os/uefi/protocols/graphics_output_protocol.zig
+++ b/lib/std/os/uefi/protocols/graphics_output_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/hii.zig b/lib/std/os/uefi/protocols/hii.zig
index 750e004c8b..960402828e 100644
--- a/lib/std/os/uefi/protocols/hii.zig
+++ b/lib/std/os/uefi/protocols/hii.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/hii_database_protocol.zig b/lib/std/os/uefi/protocols/hii_database_protocol.zig
index e34f72c2f3..d0b16ff943 100644
--- a/lib/std/os/uefi/protocols/hii_database_protocol.zig
+++ b/lib/std/os/uefi/protocols/hii_database_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/hii_popup_protocol.zig b/lib/std/os/uefi/protocols/hii_popup_protocol.zig
index 2e4f621b41..1f5c5ce0f4 100644
--- a/lib/std/os/uefi/protocols/hii_popup_protocol.zig
+++ b/lib/std/os/uefi/protocols/hii_popup_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/ip6_config_protocol.zig b/lib/std/os/uefi/protocols/ip6_config_protocol.zig
index 99ba76aa17..16002f62a6 100644
--- a/lib/std/os/uefi/protocols/ip6_config_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_config_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/ip6_protocol.zig b/lib/std/os/uefi/protocols/ip6_protocol.zig
index b39ae60b2a..578a3cfb01 100644
--- a/lib/std/os/uefi/protocols/ip6_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig b/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
index 97ab1a431c..59605cc11b 100644
--- a/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/loaded_image_protocol.zig b/lib/std/os/uefi/protocols/loaded_image_protocol.zig
index b8afcb1063..96aa10f08d 100644
--- a/lib/std/os/uefi/protocols/loaded_image_protocol.zig
+++ b/lib/std/os/uefi/protocols/loaded_image_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Handle = uefi.Handle;
diff --git a/lib/std/os/uefi/protocols/managed_network_protocol.zig b/lib/std/os/uefi/protocols/managed_network_protocol.zig
index 34ef6c40fa..9202c6f139 100644
--- a/lib/std/os/uefi/protocols/managed_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig b/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
index e9657e4456..0c684336c8 100644
--- a/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/rng_protocol.zig b/lib/std/os/uefi/protocols/rng_protocol.zig
index a32b202f44..713b76b371 100644
--- a/lib/std/os/uefi/protocols/rng_protocol.zig
+++ b/lib/std/os/uefi/protocols/rng_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/shell_parameters_protocol.zig b/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
index afbd26e939..7ec46b732c 100644
--- a/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
+++ b/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const FileHandle = uefi.FileHandle;
diff --git a/lib/std/os/uefi/protocols/simple_file_system_protocol.zig b/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
index 119c1e6587..946c88a89b 100644
--- a/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const FileProtocol = uefi.protocols.FileProtocol;
diff --git a/lib/std/os/uefi/protocols/simple_network_protocol.zig b/lib/std/os/uefi/protocols/simple_network_protocol.zig
index ac7446036e..f74f11a857 100644
--- a/lib/std/os/uefi/protocols/simple_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_network_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_pointer_protocol.zig b/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
index d217ab5930..5f8ca7569e 100644
--- a/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig b/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
index 4a2b098e61..096013bfb0 100644
--- a/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_input_protocol.zig b/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
index 58ed071331..d093186532 100644
--- a/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_output_protocol.zig b/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
index 84f540cb78..f9bbc37140 100644
--- a/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/udp6_protocol.zig b/lib/std/os/uefi/protocols/udp6_protocol.zig
index 46c76beaa6..50b7dae7c4 100644
--- a/lib/std/os/uefi/protocols/udp6_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig b/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
index 811692adc3..4f4e0a2638 100644
--- a/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/status.zig b/lib/std/os/uefi/status.zig
index 0da4508e8f..3e86962202 100644
--- a/lib/std/os/uefi/status.zig
+++ b/lib/std/os/uefi/status.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const high_bit = 1 << @typeInfo(usize).Int.bits - 1;
 
 pub const Status = extern enum(usize) {
diff --git a/lib/std/os/uefi/tables.zig b/lib/std/os/uefi/tables.zig
index 0011c80a9c..b796eb6e06 100644
--- a/lib/std/os/uefi/tables.zig
+++ b/lib/std/os/uefi/tables.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const AllocateType = @import("tables/boot_services.zig").AllocateType;
 pub const BootServices = @import("tables/boot_services.zig").BootServices;
 pub const ConfigurationTable = @import("tables/configuration_table.zig").ConfigurationTable;
diff --git a/lib/std/os/uefi/tables/boot_services.zig b/lib/std/os/uefi/tables/boot_services.zig
index a1d2c1ca59..09431cf3f4 100644
--- a/lib/std/os/uefi/tables/boot_services.zig
+++ b/lib/std/os/uefi/tables/boot_services.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/tables/configuration_table.zig b/lib/std/os/uefi/tables/configuration_table.zig
index 0ac3bd73c8..c7dedad5fb 100644
--- a/lib/std/os/uefi/tables/configuration_table.zig
+++ b/lib/std/os/uefi/tables/configuration_table.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/tables/runtime_services.zig b/lib/std/os/uefi/tables/runtime_services.zig
index 981e07275b..a2012168ee 100644
--- a/lib/std/os/uefi/tables/runtime_services.zig
+++ b/lib/std/os/uefi/tables/runtime_services.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const TableHeader = uefi.tables.TableHeader;
diff --git a/lib/std/os/uefi/tables/system_table.zig b/lib/std/os/uefi/tables/system_table.zig
index 40fec34d44..cbe66fbb68 100644
--- a/lib/std/os/uefi/tables/system_table.zig
+++ b/lib/std/os/uefi/tables/system_table.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const BootServices = uefi.tables.BootServices;
 const ConfigurationTable = uefi.tables.ConfigurationTable;
diff --git a/lib/std/os/uefi/tables/table_header.zig b/lib/std/os/uefi/tables/table_header.zig
index d5d4094232..a8343c967a 100644
--- a/lib/std/os/uefi/tables/table_header.zig
+++ b/lib/std/os/uefi/tables/table_header.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const TableHeader = extern struct {
     signature: u64,
     revision: u32,
diff --git a/lib/std/os/wasi.zig b/lib/std/os/wasi.zig
index 23df66f385..899541f3fe 100644
--- a/lib/std/os/wasi.zig
+++ b/lib/std/os/wasi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // wasi_snapshot_preview1 spec available (in witx format) here:
 // * typenames -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx
 // * module -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/wasi_snapshot_preview1.witx
diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 2f2369a458..a23eead14f 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file contains thin wrappers around Windows-specific APIs, with these
 // specific goals in mind:
 // * Convert "errno"-style error codes into Zig errors.
diff --git a/lib/std/os/windows/advapi32.zig b/lib/std/os/windows/advapi32.zig
index 6364c5bddb..b6dbaf9a7a 100644
--- a/lib/std/os/windows/advapi32.zig
+++ b/lib/std/os/windows/advapi32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "advapi32" fn RegOpenKeyExW(
diff --git a/lib/std/os/windows/bits.zig b/lib/std/os/windows/bits.zig
index 44bc1ba437..d22f42d6e8 100644
--- a/lib/std/os/windows/bits.zig
+++ b/lib/std/os/windows/bits.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Platform-dependent types and values that are used along with OS-specific APIs.
 
 const builtin = @import("builtin");
diff --git a/lib/std/os/windows/gdi32.zig b/lib/std/os/windows/gdi32.zig
index 676065b574..f36732ba1e 100644
--- a/lib/std/os/windows/gdi32.zig
+++ b/lib/std/os/windows/gdi32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub const PIXELFORMATDESCRIPTOR = extern struct {
diff --git a/lib/std/os/windows/kernel32.zig b/lib/std/os/windows/kernel32.zig
index b50143b075..fce9eea908 100644
--- a/lib/std/os/windows/kernel32.zig
+++ b/lib/std/os/windows/kernel32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "kernel32" fn AddVectoredExceptionHandler(First: c_ulong, Handler: ?VECTORED_EXCEPTION_HANDLER) callconv(.Stdcall) ?*c_void;
diff --git a/lib/std/os/windows/lang.zig b/lib/std/os/windows/lang.zig
index b173a62a73..61efa3bdb3 100644
--- a/lib/std/os/windows/lang.zig
+++ b/lib/std/os/windows/lang.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const NEUTRAL = 0x00;
 pub const INVARIANT = 0x7f;
 pub const AFRIKAANS = 0x36;
diff --git a/lib/std/os/windows/ntdll.zig b/lib/std/os/windows/ntdll.zig
index 5edad85c20..c11098b6bc 100644
--- a/lib/std/os/windows/ntdll.zig
+++ b/lib/std/os/windows/ntdll.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "NtDll" fn RtlGetVersion(
diff --git a/lib/std/os/windows/ntstatus.zig b/lib/std/os/windows/ntstatus.zig
index 5c9344d639..0e567df510 100644
--- a/lib/std/os/windows/ntstatus.zig
+++ b/lib/std/os/windows/ntstatus.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // NTSTATUS codes from https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/596a1078-e883-4972-9bbc-49e60bebca55?
 pub const NTSTATUS = extern enum(u32) {
     /// The operation completed successfully.
diff --git a/lib/std/os/windows/ole32.zig b/lib/std/os/windows/ole32.zig
index a472089078..f46ee33047 100644
--- a/lib/std/os/windows/ole32.zig
+++ b/lib/std/os/windows/ole32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "ole32" fn CoTaskMemFree(pv: LPVOID) callconv(.Stdcall) void;
diff --git a/lib/std/os/windows/psapi.zig b/lib/std/os/windows/psapi.zig
index 1a5a7d4bf2..db6fc93314 100644
--- a/lib/std/os/windows/psapi.zig
+++ b/lib/std/os/windows/psapi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "psapi" fn EmptyWorkingSet(hProcess: HANDLE) callconv(.Stdcall) BOOL;
diff --git a/lib/std/os/windows/shell32.zig b/lib/std/os/windows/shell32.zig
index 762589c6de..ce9d54f6df 100644
--- a/lib/std/os/windows/shell32.zig
+++ b/lib/std/os/windows/shell32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "shell32" fn SHGetKnownFolderPath(rfid: *const KNOWNFOLDERID, dwFlags: DWORD, hToken: ?HANDLE, ppszPath: *[*:0]WCHAR) callconv(.Stdcall) HRESULT;
diff --git a/lib/std/os/windows/sublang.zig b/lib/std/os/windows/sublang.zig
index e9929c6d79..5249e8ed0a 100644
--- a/lib/std/os/windows/sublang.zig
+++ b/lib/std/os/windows/sublang.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const NEUTRAL = 0x00;
 pub const DEFAULT = 0x01;
 pub const SYS_DEFAULT = 0x02;
diff --git a/lib/std/os/windows/user32.zig b/lib/std/os/windows/user32.zig
index 3877e19ad8..6a80a92cad 100644
--- a/lib/std/os/windows/user32.zig
+++ b/lib/std/os/windows/user32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 // PM
diff --git a/lib/std/os/windows/win32error.zig b/lib/std/os/windows/win32error.zig
index 037797e25f..2e1f111d92 100644
--- a/lib/std/os/windows/win32error.zig
+++ b/lib/std/os/windows/win32error.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Codes are from https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/18d8fbe8-a967-4f1c-ae50-99ca8e491d2d
 pub const Win32Error = extern enum(u16) {
     /// The operation completed successfully.
diff --git a/lib/std/os/windows/ws2_32.zig b/lib/std/os/windows/ws2_32.zig
index 1e36a72038..cfc212d15a 100644
--- a/lib/std/os/windows/ws2_32.zig
+++ b/lib/std/os/windows/ws2_32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub const SOCKET = *@Type(.Opaque);
diff --git a/lib/std/packed_int_array.zig b/lib/std/packed_int_array.zig
index 07a79655ad..de99afa303 100644
--- a/lib/std/packed_int_array.zig
+++ b/lib/std/packed_int_array.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/pdb.zig b/lib/std/pdb.zig
index a702a8aed6..e8c61f859d 100644
--- a/lib/std/pdb.zig
+++ b/lib/std/pdb.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const io = std.io;
diff --git a/lib/std/priority_queue.zig b/lib/std/priority_queue.zig
index 69b9e06a5b..1c0d230d4d 100644
--- a/lib/std/priority_queue.zig
+++ b/lib/std/priority_queue.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const Allocator = std.mem.Allocator;
 const assert = std.debug.assert;
diff --git a/lib/std/process.zig b/lib/std/process.zig
index 1a0dfad474..69befa2fc8 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/progress.zig b/lib/std/progress.zig
index b81e81aa2c..654d8cc228 100644
--- a/lib/std/progress.zig
+++ b/lib/std/progress.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const windows = std.os.windows;
 const testing = std.testing;
diff --git a/lib/std/rand.zig b/lib/std/rand.zig
index 1e5bb37592..85f11ff449 100644
--- a/lib/std/rand.zig
+++ b/lib/std/rand.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // The engines provided here should be initialized from an external source. For now, randomBytes
 // from the crypto package is the most suitable. Be sure to use a CSPRNG when required, otherwise using
 // a normal PRNG will be faster and use substantially less stack space.
diff --git a/lib/std/rand/ziggurat.zig b/lib/std/rand/ziggurat.zig
index 06728f170c..da189637bf 100644
--- a/lib/std/rand/ziggurat.zig
+++ b/lib/std/rand/ziggurat.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Implements ZIGNOR [1].
 //
 // [1]: Jurgen A. Doornik (2005). [*An Improved Ziggurat Method to Generate Normal Random Samples*]
diff --git a/lib/std/rb.zig b/lib/std/rb.zig
index a39b815e74..8cf90a1eea 100644
--- a/lib/std/rb.zig
+++ b/lib/std/rb.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/reset_event.zig b/lib/std/reset_event.zig
index 6f520773d8..31e6c28cf8 100644
--- a/lib/std/reset_event.zig
+++ b/lib/std/reset_event.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const testing = std.testing;
diff --git a/lib/std/segmented_list.zig b/lib/std/segmented_list.zig
index d39fe3e239..a63196c443 100644
--- a/lib/std/segmented_list.zig
+++ b/lib/std/segmented_list.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/sort.zig b/lib/std/sort.zig
index 464054e4a5..e2e4cc662d 100644
--- a/lib/std/sort.zig
+++ b/lib/std/sort.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/special/build_runner.zig b/lib/std/special/build_runner.zig
index 83c181e841..46d3b0b615 100644
--- a/lib/std/special/build_runner.zig
+++ b/lib/std/special/build_runner.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const root = @import("@build");
 const std = @import("std");
 const builtin = @import("builtin");
diff --git a/lib/std/special/c.zig b/lib/std/special/c.zig
index 170bb98620..f18fe11e66 100644
--- a/lib/std/special/c.zig
+++ b/lib/std/special/c.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This is Zig's multi-target implementation of libc.
 // When builtin.link_libc is true, we need to export all the functions and
 // provide an entire C API.
diff --git a/lib/std/special/compiler_rt.zig b/lib/std/special/compiler_rt.zig
index 2716de8113..42db6b96bf 100644
--- a/lib/std/special/compiler_rt.zig
+++ b/lib/std/special/compiler_rt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const is_test = builtin.is_test;
diff --git a/lib/std/special/compiler_rt/addXf3.zig b/lib/std/special/compiler_rt/addXf3.zig
index 849efa1cd2..6dd0faaebb 100644
--- a/lib/std/special/compiler_rt/addXf3.zig
+++ b/lib/std/special/compiler_rt/addXf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/02d85149a05cb1f6dc49f0ba7a2ceca53718ae17/compiler-rt/lib/builtins/fp_add_impl.inc
diff --git a/lib/std/special/compiler_rt/addXf3_test.zig b/lib/std/special/compiler_rt/addXf3_test.zig
index af991b37e9..3d75309507 100644
--- a/lib/std/special/compiler_rt/addXf3_test.zig
+++ b/lib/std/special/compiler_rt/addXf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/02d85149a05cb1f6dc49f0ba7a2ceca53718ae17/compiler-rt/test/builtins/Unit/addtf3_test.c
diff --git a/lib/std/special/compiler_rt/arm.zig b/lib/std/special/compiler_rt/arm.zig
index 5e718ed4c4..1eecd3ceac 100644
--- a/lib/std/special/compiler_rt/arm.zig
+++ b/lib/std/special/compiler_rt/arm.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // ARM specific builtins
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/ashldi3_test.zig b/lib/std/special/compiler_rt/ashldi3_test.zig
index 547c315b24..874681a79a 100644
--- a/lib/std/special/compiler_rt/ashldi3_test.zig
+++ b/lib/std/special/compiler_rt/ashldi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashldi3 = @import("shift.zig").__ashldi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashlti3_test.zig b/lib/std/special/compiler_rt/ashlti3_test.zig
index a4510f52d7..42cb3a47bb 100644
--- a/lib/std/special/compiler_rt/ashlti3_test.zig
+++ b/lib/std/special/compiler_rt/ashlti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashlti3 = @import("shift.zig").__ashlti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashrdi3_test.zig b/lib/std/special/compiler_rt/ashrdi3_test.zig
index 3ba30edbfe..e80b95af9e 100644
--- a/lib/std/special/compiler_rt/ashrdi3_test.zig
+++ b/lib/std/special/compiler_rt/ashrdi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashrdi3 = @import("shift.zig").__ashrdi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashrti3_test.zig b/lib/std/special/compiler_rt/ashrti3_test.zig
index 43d5d11910..958b8a8a74 100644
--- a/lib/std/special/compiler_rt/ashrti3_test.zig
+++ b/lib/std/special/compiler_rt/ashrti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashrti3 = @import("shift.zig").__ashrti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/atomics.zig b/lib/std/special/compiler_rt/atomics.zig
index e2cb45bef3..a76695ff2c 100644
--- a/lib/std/special/compiler_rt/atomics.zig
+++ b/lib/std/special/compiler_rt/atomics.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 
diff --git a/lib/std/special/compiler_rt/aulldiv.zig b/lib/std/special/compiler_rt/aulldiv.zig
index 2e2dd364d5..cf9b26c5a6 100644
--- a/lib/std/special/compiler_rt/aulldiv.zig
+++ b/lib/std/special/compiler_rt/aulldiv.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 pub fn _alldiv(a: i64, b: i64) callconv(.Stdcall) i64 {
diff --git a/lib/std/special/compiler_rt/aullrem.zig b/lib/std/special/compiler_rt/aullrem.zig
index 4244f1bb80..7c981cc088 100644
--- a/lib/std/special/compiler_rt/aullrem.zig
+++ b/lib/std/special/compiler_rt/aullrem.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 pub fn _allrem(a: i64, b: i64) callconv(.Stdcall) i64 {
diff --git a/lib/std/special/compiler_rt/clear_cache.zig b/lib/std/special/compiler_rt/clear_cache.zig
index 6306d5b575..d862f739d3 100644
--- a/lib/std/special/compiler_rt/clear_cache.zig
+++ b/lib/std/special/compiler_rt/clear_cache.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const arch = std.builtin.cpu.arch;
 const os = std.builtin.os.tag;
diff --git a/lib/std/special/compiler_rt/clzsi2.zig b/lib/std/special/compiler_rt/clzsi2.zig
index 0c9c5d4318..ac314ff9e0 100644
--- a/lib/std/special/compiler_rt/clzsi2.zig
+++ b/lib/std/special/compiler_rt/clzsi2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 fn __clzsi2_generic(a: i32) callconv(.C) i32 {
diff --git a/lib/std/special/compiler_rt/clzsi2_test.zig b/lib/std/special/compiler_rt/clzsi2_test.zig
index 8a2896fcb6..2d9ba3d1b3 100644
--- a/lib/std/special/compiler_rt/clzsi2_test.zig
+++ b/lib/std/special/compiler_rt/clzsi2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const clzsi2 = @import("clzsi2.zig");
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/compareXf2.zig b/lib/std/special/compiler_rt/compareXf2.zig
index 6489d283ff..f50dc67474 100644
--- a/lib/std/special/compiler_rt/compareXf2.zig
+++ b/lib/std/special/compiler_rt/compareXf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/comparesf2.c
diff --git a/lib/std/special/compiler_rt/comparedf2_test.zig b/lib/std/special/compiler_rt/comparedf2_test.zig
index 16a2a258ce..9d681b8f81 100644
--- a/lib/std/special/compiler_rt/comparedf2_test.zig
+++ b/lib/std/special/compiler_rt/comparedf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/comparedf2_test.c
diff --git a/lib/std/special/compiler_rt/comparesf2_test.zig b/lib/std/special/compiler_rt/comparesf2_test.zig
index e3966c021b..da7fe940a0 100644
--- a/lib/std/special/compiler_rt/comparesf2_test.zig
+++ b/lib/std/special/compiler_rt/comparesf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/comparesf2_test.c
diff --git a/lib/std/special/compiler_rt/divdf3.zig b/lib/std/special/compiler_rt/divdf3.zig
index 8b7525e931..ad72f96057 100644
--- a/lib/std/special/compiler_rt/divdf3.zig
+++ b/lib/std/special/compiler_rt/divdf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/divdf3.c
diff --git a/lib/std/special/compiler_rt/divdf3_test.zig b/lib/std/special/compiler_rt/divdf3_test.zig
index 61d6731ea7..04cac956d2 100644
--- a/lib/std/special/compiler_rt/divdf3_test.zig
+++ b/lib/std/special/compiler_rt/divdf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divdf3_test.c
diff --git a/lib/std/special/compiler_rt/divsf3.zig b/lib/std/special/compiler_rt/divsf3.zig
index 62a6c56262..80af806eb1 100644
--- a/lib/std/special/compiler_rt/divsf3.zig
+++ b/lib/std/special/compiler_rt/divsf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/divsf3.c
diff --git a/lib/std/special/compiler_rt/divsf3_test.zig b/lib/std/special/compiler_rt/divsf3_test.zig
index 188842af58..30dcba462b 100644
--- a/lib/std/special/compiler_rt/divsf3_test.zig
+++ b/lib/std/special/compiler_rt/divsf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divsf3_test.c
diff --git a/lib/std/special/compiler_rt/divtf3.zig b/lib/std/special/compiler_rt/divtf3.zig
index d177454ad2..f6f7c1bf7d 100644
--- a/lib/std/special/compiler_rt/divtf3.zig
+++ b/lib/std/special/compiler_rt/divtf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/divtf3_test.zig b/lib/std/special/compiler_rt/divtf3_test.zig
index 4940b2c403..cf6f2f2eaf 100644
--- a/lib/std/special/compiler_rt/divtf3_test.zig
+++ b/lib/std/special/compiler_rt/divtf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const math = std.math;
 const testing = std.testing;
diff --git a/lib/std/special/compiler_rt/divti3.zig b/lib/std/special/compiler_rt/divti3.zig
index afb30950b8..4b7d459991 100644
--- a/lib/std/special/compiler_rt/divti3.zig
+++ b/lib/std/special/compiler_rt/divti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmod = @import("udivmod.zig").udivmod;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/divti3_test.zig b/lib/std/special/compiler_rt/divti3_test.zig
index 8601cfae03..18fab24ed1 100644
--- a/lib/std/special/compiler_rt/divti3_test.zig
+++ b/lib/std/special/compiler_rt/divti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __divti3 = @import("divti3.zig").__divti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/extendXfYf2.zig b/lib/std/special/compiler_rt/extendXfYf2.zig
index 6aca0ac98f..e0536c04ad 100644
--- a/lib/std/special/compiler_rt/extendXfYf2.zig
+++ b/lib/std/special/compiler_rt/extendXfYf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
diff --git a/lib/std/special/compiler_rt/extendXfYf2_test.zig b/lib/std/special/compiler_rt/extendXfYf2_test.zig
index e2664f6bae..d82a8baf4c 100644
--- a/lib/std/special/compiler_rt/extendXfYf2_test.zig
+++ b/lib/std/special/compiler_rt/extendXfYf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const __extenddftf2 = @import("extendXfYf2.zig").__extenddftf2;
 const __extendhfsf2 = @import("extendXfYf2.zig").__extendhfsf2;
diff --git a/lib/std/special/compiler_rt/fixdfdi.zig b/lib/std/special/compiler_rt/fixdfdi.zig
index 11b5009129..28de1ecd23 100644
--- a/lib/std/special/compiler_rt/fixdfdi.zig
+++ b/lib/std/special/compiler_rt/fixdfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfdi_test.zig b/lib/std/special/compiler_rt/fixdfdi_test.zig
index 92dbdc2a5e..83835106cd 100644
--- a/lib/std/special/compiler_rt/fixdfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixdfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixdfdi = @import("fixdfdi.zig").__fixdfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixdfsi.zig b/lib/std/special/compiler_rt/fixdfsi.zig
index 8a6d8da342..678c75d0c1 100644
--- a/lib/std/special/compiler_rt/fixdfsi.zig
+++ b/lib/std/special/compiler_rt/fixdfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfsi_test.zig b/lib/std/special/compiler_rt/fixdfsi_test.zig
index fb90518892..8050a1b9c5 100644
--- a/lib/std/special/compiler_rt/fixdfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixdfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixdfsi = @import("fixdfsi.zig").__fixdfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixdfti.zig b/lib/std/special/compiler_rt/fixdfti.zig
index 0e21f0ba19..3d9266ae1f 100644
--- a/lib/std/special/compiler_rt/fixdfti.zig
+++ b/lib/std/special/compiler_rt/fixdfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfti_test.zig b/lib/std/special/compiler_rt/fixdfti_test.zig
index f66e4a3d88..796855b716 100644
--- a/lib/std/special/compiler_rt/fixdfti_test.zig
+++ b/lib/std/special/compiler_rt/fixdfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixdfti = @import("fixdfti.zig").__fixdfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixint.zig b/lib/std/special/compiler_rt/fixint.zig
index daf7a1bdc7..0bf0c8be1e 100644
--- a/lib/std/special/compiler_rt/fixint.zig
+++ b/lib/std/special/compiler_rt/fixint.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixint_test.zig b/lib/std/special/compiler_rt/fixint_test.zig
index 4efb1e6ab3..49942e5382 100644
--- a/lib/std/special/compiler_rt/fixint_test.zig
+++ b/lib/std/special/compiler_rt/fixint_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfdi.zig b/lib/std/special/compiler_rt/fixsfdi.zig
index d0d958cdd6..cc5731946d 100644
--- a/lib/std/special/compiler_rt/fixsfdi.zig
+++ b/lib/std/special/compiler_rt/fixsfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfdi_test.zig b/lib/std/special/compiler_rt/fixsfdi_test.zig
index 5888c9804d..d93c3d4218 100644
--- a/lib/std/special/compiler_rt/fixsfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixsfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixsfdi = @import("fixsfdi.zig").__fixsfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfsi.zig b/lib/std/special/compiler_rt/fixsfsi.zig
index 84395d0fa6..62334574b0 100644
--- a/lib/std/special/compiler_rt/fixsfsi.zig
+++ b/lib/std/special/compiler_rt/fixsfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfsi_test.zig b/lib/std/special/compiler_rt/fixsfsi_test.zig
index 844235bc9d..56c28d91ab 100644
--- a/lib/std/special/compiler_rt/fixsfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixsfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixsfsi = @import("fixsfsi.zig").__fixsfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfti.zig b/lib/std/special/compiler_rt/fixsfti.zig
index d7ce4b3a60..31dea953e8 100644
--- a/lib/std/special/compiler_rt/fixsfti.zig
+++ b/lib/std/special/compiler_rt/fixsfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfti_test.zig b/lib/std/special/compiler_rt/fixsfti_test.zig
index 9eb2883f38..d0bdcc4e75 100644
--- a/lib/std/special/compiler_rt/fixsfti_test.zig
+++ b/lib/std/special/compiler_rt/fixsfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixsfti = @import("fixsfti.zig").__fixsfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfdi.zig b/lib/std/special/compiler_rt/fixtfdi.zig
index 0ef3aa2259..edf70dbe49 100644
--- a/lib/std/special/compiler_rt/fixtfdi.zig
+++ b/lib/std/special/compiler_rt/fixtfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfdi_test.zig b/lib/std/special/compiler_rt/fixtfdi_test.zig
index 6baa9011c3..b926f33d50 100644
--- a/lib/std/special/compiler_rt/fixtfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixtfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixtfdi = @import("fixtfdi.zig").__fixtfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfsi.zig b/lib/std/special/compiler_rt/fixtfsi.zig
index 15e89a11b0..cf614ec8b3 100644
--- a/lib/std/special/compiler_rt/fixtfsi.zig
+++ b/lib/std/special/compiler_rt/fixtfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfsi_test.zig b/lib/std/special/compiler_rt/fixtfsi_test.zig
index c7294fe250..86207f7dbc 100644
--- a/lib/std/special/compiler_rt/fixtfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixtfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixtfsi = @import("fixtfsi.zig").__fixtfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfti.zig b/lib/std/special/compiler_rt/fixtfti.zig
index 733fa1eed1..e796b86d50 100644
--- a/lib/std/special/compiler_rt/fixtfti.zig
+++ b/lib/std/special/compiler_rt/fixtfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfti_test.zig b/lib/std/special/compiler_rt/fixtfti_test.zig
index 6b8218e2f6..65a64ac431 100644
--- a/lib/std/special/compiler_rt/fixtfti_test.zig
+++ b/lib/std/special/compiler_rt/fixtfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixtfti = @import("fixtfti.zig").__fixtfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixuint.zig b/lib/std/special/compiler_rt/fixuint.zig
index 1e96b7c283..01eb03baa5 100644
--- a/lib/std/special/compiler_rt/fixuint.zig
+++ b/lib/std/special/compiler_rt/fixuint.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const Log2Int = @import("std").math.Log2Int;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfdi.zig b/lib/std/special/compiler_rt/fixunsdfdi.zig
index 800c9b1148..19f94c95a8 100644
--- a/lib/std/special/compiler_rt/fixunsdfdi.zig
+++ b/lib/std/special/compiler_rt/fixunsdfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfdi_test.zig b/lib/std/special/compiler_rt/fixunsdfdi_test.zig
index 67eeb70520..da6fef3376 100644
--- a/lib/std/special/compiler_rt/fixunsdfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunsdfdi = @import("fixunsdfdi.zig").__fixunsdfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfsi.zig b/lib/std/special/compiler_rt/fixunsdfsi.zig
index 156c21a887..2f622aff39 100644
--- a/lib/std/special/compiler_rt/fixunsdfsi.zig
+++ b/lib/std/special/compiler_rt/fixunsdfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfsi_test.zig b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
index c006473fb9..ddbb05c705 100644
--- a/lib/std/special/compiler_rt/fixunsdfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunsdfsi = @import("fixunsdfsi.zig").__fixunsdfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfti.zig b/lib/std/special/compiler_rt/fixunsdfti.zig
index 3dcec6bf89..f11f6b937f 100644
--- a/lib/std/special/compiler_rt/fixunsdfti.zig
+++ b/lib/std/special/compiler_rt/fixunsdfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfti_test.zig b/lib/std/special/compiler_rt/fixunsdfti_test.zig
index 8241900692..11ba3bc425 100644
--- a/lib/std/special/compiler_rt/fixunsdfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunsdfti = @import("fixunsdfti.zig").__fixunsdfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfdi.zig b/lib/std/special/compiler_rt/fixunssfdi.zig
index ec00a7ee35..5dd9b27d10 100644
--- a/lib/std/special/compiler_rt/fixunssfdi.zig
+++ b/lib/std/special/compiler_rt/fixunssfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfdi_test.zig b/lib/std/special/compiler_rt/fixunssfdi_test.zig
index e2089822d2..018c94ce7c 100644
--- a/lib/std/special/compiler_rt/fixunssfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunssfdi = @import("fixunssfdi.zig").__fixunssfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfsi.zig b/lib/std/special/compiler_rt/fixunssfsi.zig
index a4e5a323f5..ce983cb78a 100644
--- a/lib/std/special/compiler_rt/fixunssfsi.zig
+++ b/lib/std/special/compiler_rt/fixunssfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfsi_test.zig b/lib/std/special/compiler_rt/fixunssfsi_test.zig
index 4aee84d2d2..98cac8a1e4 100644
--- a/lib/std/special/compiler_rt/fixunssfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunssfsi = @import("fixunssfsi.zig").__fixunssfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfti.zig b/lib/std/special/compiler_rt/fixunssfti.zig
index dff9eb7498..bbaeafd6a8 100644
--- a/lib/std/special/compiler_rt/fixunssfti.zig
+++ b/lib/std/special/compiler_rt/fixunssfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfti_test.zig b/lib/std/special/compiler_rt/fixunssfti_test.zig
index 4cb27cbb8a..b5c79906b7 100644
--- a/lib/std/special/compiler_rt/fixunssfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunssfti = @import("fixunssfti.zig").__fixunssfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfdi.zig b/lib/std/special/compiler_rt/fixunstfdi.zig
index 907116c165..3062e5322c 100644
--- a/lib/std/special/compiler_rt/fixunstfdi.zig
+++ b/lib/std/special/compiler_rt/fixunstfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfdi_test.zig b/lib/std/special/compiler_rt/fixunstfdi_test.zig
index 0d47641c09..299c509cea 100644
--- a/lib/std/special/compiler_rt/fixunstfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunstfdi = @import("fixunstfdi.zig").__fixunstfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfsi.zig b/lib/std/special/compiler_rt/fixunstfsi.zig
index c66a3f18b4..6836e5df36 100644
--- a/lib/std/special/compiler_rt/fixunstfsi.zig
+++ b/lib/std/special/compiler_rt/fixunstfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfsi_test.zig b/lib/std/special/compiler_rt/fixunstfsi_test.zig
index 286567629a..2e5139e5e2 100644
--- a/lib/std/special/compiler_rt/fixunstfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunstfsi = @import("fixunstfsi.zig").__fixunstfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfti.zig b/lib/std/special/compiler_rt/fixunstfti.zig
index 1867c69234..da3319ee5c 100644
--- a/lib/std/special/compiler_rt/fixunstfti.zig
+++ b/lib/std/special/compiler_rt/fixunstfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfti_test.zig b/lib/std/special/compiler_rt/fixunstfti_test.zig
index 62a9bbfecf..2fbde63e63 100644
--- a/lib/std/special/compiler_rt/fixunstfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunstfti = @import("fixunstfti.zig").__fixunstfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatdidf.zig b/lib/std/special/compiler_rt/floatdidf.zig
index afe9e906fd..2a1ba4cadd 100644
--- a/lib/std/special/compiler_rt/floatdidf.zig
+++ b/lib/std/special/compiler_rt/floatdidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/special/compiler_rt/floatdidf_test.zig b/lib/std/special/compiler_rt/floatdidf_test.zig
index c854183809..a2072cc922 100644
--- a/lib/std/special/compiler_rt/floatdidf_test.zig
+++ b/lib/std/special/compiler_rt/floatdidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatdidf = @import("floatdidf.zig").__floatdidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatditf.zig b/lib/std/special/compiler_rt/floatditf.zig
index 581a0e0532..aa945ca5dd 100644
--- a/lib/std/special/compiler_rt/floatditf.zig
+++ b/lib/std/special/compiler_rt/floatditf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatditf_test.zig b/lib/std/special/compiler_rt/floatditf_test.zig
index 8cdb8157a9..ff4f10927c 100644
--- a/lib/std/special/compiler_rt/floatditf_test.zig
+++ b/lib/std/special/compiler_rt/floatditf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatditf = @import("floatditf.zig").__floatditf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatsiXf.zig b/lib/std/special/compiler_rt/floatsiXf.zig
index 6a1dc422b7..75db3d7040 100644
--- a/lib/std/special/compiler_rt/floatsiXf.zig
+++ b/lib/std/special/compiler_rt/floatsiXf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floattidf.zig b/lib/std/special/compiler_rt/floattidf.zig
index 6b5013287b..73d86f7747 100644
--- a/lib/std/special/compiler_rt/floattidf.zig
+++ b/lib/std/special/compiler_rt/floattidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattidf_test.zig b/lib/std/special/compiler_rt/floattidf_test.zig
index 4914342c31..d299ed8087 100644
--- a/lib/std/special/compiler_rt/floattidf_test.zig
+++ b/lib/std/special/compiler_rt/floattidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floattidf = @import("floattidf.zig").__floattidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floattisf.zig b/lib/std/special/compiler_rt/floattisf.zig
index 3f020dadd8..7975d59e83 100644
--- a/lib/std/special/compiler_rt/floattisf.zig
+++ b/lib/std/special/compiler_rt/floattisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattisf_test.zig b/lib/std/special/compiler_rt/floattisf_test.zig
index a6aa115307..f5638c2106 100644
--- a/lib/std/special/compiler_rt/floattisf_test.zig
+++ b/lib/std/special/compiler_rt/floattisf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floattisf = @import("floattisf.zig").__floattisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floattitf.zig b/lib/std/special/compiler_rt/floattitf.zig
index 90bc241306..87408ea445 100644
--- a/lib/std/special/compiler_rt/floattitf.zig
+++ b/lib/std/special/compiler_rt/floattitf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattitf_test.zig b/lib/std/special/compiler_rt/floattitf_test.zig
index 53e3e48bdb..c4014a6298 100644
--- a/lib/std/special/compiler_rt/floattitf_test.zig
+++ b/lib/std/special/compiler_rt/floattitf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floattitf = @import("floattitf.zig").__floattitf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatundidf.zig b/lib/std/special/compiler_rt/floatundidf.zig
index 1efe55da40..a88ca4a03d 100644
--- a/lib/std/special/compiler_rt/floatundidf.zig
+++ b/lib/std/special/compiler_rt/floatundidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/special/compiler_rt/floatundidf_test.zig b/lib/std/special/compiler_rt/floatundidf_test.zig
index 084ada51c9..c0651cb359 100644
--- a/lib/std/special/compiler_rt/floatundidf_test.zig
+++ b/lib/std/special/compiler_rt/floatundidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatundidf = @import("floatundidf.zig").__floatundidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatundisf.zig b/lib/std/special/compiler_rt/floatundisf.zig
index ff242721d6..b580ec91fd 100644
--- a/lib/std/special/compiler_rt/floatundisf.zig
+++ b/lib/std/special/compiler_rt/floatundisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunditf.zig b/lib/std/special/compiler_rt/floatunditf.zig
index 209f66fc2e..90191c6388 100644
--- a/lib/std/special/compiler_rt/floatunditf.zig
+++ b/lib/std/special/compiler_rt/floatunditf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatunditf_test.zig b/lib/std/special/compiler_rt/floatunditf_test.zig
index 7bb3333693..19d1b4a2a3 100644
--- a/lib/std/special/compiler_rt/floatunditf_test.zig
+++ b/lib/std/special/compiler_rt/floatunditf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatunditf = @import("floatunditf.zig").__floatunditf;
 
 fn test__floatunditf(a: u64, expected_hi: u64, expected_lo: u64) void {
diff --git a/lib/std/special/compiler_rt/floatunsidf.zig b/lib/std/special/compiler_rt/floatunsidf.zig
index 771b4938e1..c9a31eff8e 100644
--- a/lib/std/special/compiler_rt/floatunsidf.zig
+++ b/lib/std/special/compiler_rt/floatunsidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunsisf.zig b/lib/std/special/compiler_rt/floatunsisf.zig
index c11243e6e4..17eae51092 100644
--- a/lib/std/special/compiler_rt/floatunsisf.zig
+++ b/lib/std/special/compiler_rt/floatunsisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunsitf.zig b/lib/std/special/compiler_rt/floatunsitf.zig
index a10ff6b703..ceb55f12c8 100644
--- a/lib/std/special/compiler_rt/floatunsitf.zig
+++ b/lib/std/special/compiler_rt/floatunsitf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatunsitf_test.zig b/lib/std/special/compiler_rt/floatunsitf_test.zig
index 52e4786903..deb95ca396 100644
--- a/lib/std/special/compiler_rt/floatunsitf_test.zig
+++ b/lib/std/special/compiler_rt/floatunsitf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatunsitf = @import("floatunsitf.zig").__floatunsitf;
 
 fn test__floatunsitf(a: u64, expected_hi: u64, expected_lo: u64) void {
diff --git a/lib/std/special/compiler_rt/floatuntidf.zig b/lib/std/special/compiler_rt/floatuntidf.zig
index 5b5adc0491..adb804d0ec 100644
--- a/lib/std/special/compiler_rt/floatuntidf.zig
+++ b/lib/std/special/compiler_rt/floatuntidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntidf_test.zig b/lib/std/special/compiler_rt/floatuntidf_test.zig
index 974f3e4be3..cce3893860 100644
--- a/lib/std/special/compiler_rt/floatuntidf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatuntidf = @import("floatuntidf.zig").__floatuntidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatuntisf.zig b/lib/std/special/compiler_rt/floatuntisf.zig
index 33e6e41a84..d0c9a76562 100644
--- a/lib/std/special/compiler_rt/floatuntisf.zig
+++ b/lib/std/special/compiler_rt/floatuntisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntisf_test.zig b/lib/std/special/compiler_rt/floatuntisf_test.zig
index 3a97807066..42379d8084 100644
--- a/lib/std/special/compiler_rt/floatuntisf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntisf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatuntisf = @import("floatuntisf.zig").__floatuntisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatuntitf.zig b/lib/std/special/compiler_rt/floatuntitf.zig
index 0b96076206..c87ff50e9a 100644
--- a/lib/std/special/compiler_rt/floatuntitf.zig
+++ b/lib/std/special/compiler_rt/floatuntitf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntitf_test.zig b/lib/std/special/compiler_rt/floatuntitf_test.zig
index 09f3eabb3e..62c9b631df 100644
--- a/lib/std/special/compiler_rt/floatuntitf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntitf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatuntitf = @import("floatuntitf.zig").__floatuntitf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/int.zig b/lib/std/special/compiler_rt/int.zig
index a72c13e233..141c4e52c1 100644
--- a/lib/std/special/compiler_rt/int.zig
+++ b/lib/std/special/compiler_rt/int.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Builtin functions that operate on integer types
 const builtin = @import("builtin");
 const testing = @import("std").testing;
diff --git a/lib/std/special/compiler_rt/lshrdi3_test.zig b/lib/std/special/compiler_rt/lshrdi3_test.zig
index 906d428d1e..de83f0a9c8 100644
--- a/lib/std/special/compiler_rt/lshrdi3_test.zig
+++ b/lib/std/special/compiler_rt/lshrdi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __lshrdi3 = @import("shift.zig").__lshrdi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/lshrti3_test.zig b/lib/std/special/compiler_rt/lshrti3_test.zig
index c0aa191a6f..f831e8b132 100644
--- a/lib/std/special/compiler_rt/lshrti3_test.zig
+++ b/lib/std/special/compiler_rt/lshrti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __lshrti3 = @import("shift.zig").__lshrti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/modti3.zig b/lib/std/special/compiler_rt/modti3.zig
index 78be44026c..1f859c2329 100644
--- a/lib/std/special/compiler_rt/modti3.zig
+++ b/lib/std/special/compiler_rt/modti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/modti3.c
diff --git a/lib/std/special/compiler_rt/modti3_test.zig b/lib/std/special/compiler_rt/modti3_test.zig
index 10f81d59d2..cad60c015e 100644
--- a/lib/std/special/compiler_rt/modti3_test.zig
+++ b/lib/std/special/compiler_rt/modti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __modti3 = @import("modti3.zig").__modti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/mulXf3.zig b/lib/std/special/compiler_rt/mulXf3.zig
index af49d27952..b6984ebbb6 100644
--- a/lib/std/special/compiler_rt/mulXf3.zig
+++ b/lib/std/special/compiler_rt/mulXf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/fp_mul_impl.inc
diff --git a/lib/std/special/compiler_rt/mulXf3_test.zig b/lib/std/special/compiler_rt/mulXf3_test.zig
index 57dc385321..c9994b089b 100644
--- a/lib/std/special/compiler_rt/mulXf3_test.zig
+++ b/lib/std/special/compiler_rt/mulXf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/test/builtins/Unit/multf3_test.c
diff --git a/lib/std/special/compiler_rt/muldi3.zig b/lib/std/special/compiler_rt/muldi3.zig
index 4f605d441c..2de96ea66c 100644
--- a/lib/std/special/compiler_rt/muldi3.zig
+++ b/lib/std/special/compiler_rt/muldi3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 // Ported from
diff --git a/lib/std/special/compiler_rt/muldi3_test.zig b/lib/std/special/compiler_rt/muldi3_test.zig
index db4daf1e1e..b4962189cd 100644
--- a/lib/std/special/compiler_rt/muldi3_test.zig
+++ b/lib/std/special/compiler_rt/muldi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __muldi3 = @import("muldi3.zig").__muldi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/mulodi4.zig b/lib/std/special/compiler_rt/mulodi4.zig
index b70d1657e7..b05931e937 100644
--- a/lib/std/special/compiler_rt/mulodi4.zig
+++ b/lib/std/special/compiler_rt/mulodi4.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/mulodi4_test.zig b/lib/std/special/compiler_rt/mulodi4_test.zig
index 803d60e8fa..a96f7a1996 100644
--- a/lib/std/special/compiler_rt/mulodi4_test.zig
+++ b/lib/std/special/compiler_rt/mulodi4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __mulodi4 = @import("mulodi4.zig").__mulodi4;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/muloti4.zig b/lib/std/special/compiler_rt/muloti4.zig
index 190959b801..4beafa3e15 100644
--- a/lib/std/special/compiler_rt/muloti4.zig
+++ b/lib/std/special/compiler_rt/muloti4.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/muloti4_test.zig b/lib/std/special/compiler_rt/muloti4_test.zig
index f94a13e04f..44ab93a069 100644
--- a/lib/std/special/compiler_rt/muloti4_test.zig
+++ b/lib/std/special/compiler_rt/muloti4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __muloti4 = @import("muloti4.zig").__muloti4;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/multi3.zig b/lib/std/special/compiler_rt/multi3.zig
index c237f1b259..fad73789ac 100644
--- a/lib/std/special/compiler_rt/multi3.zig
+++ b/lib/std/special/compiler_rt/multi3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/multi3_test.zig b/lib/std/special/compiler_rt/multi3_test.zig
index 92c580e20f..04b70d0538 100644
--- a/lib/std/special/compiler_rt/multi3_test.zig
+++ b/lib/std/special/compiler_rt/multi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __multi3 = @import("multi3.zig").__multi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/negXf2.zig b/lib/std/special/compiler_rt/negXf2.zig
index 0739ecb83c..11f9e401e9 100644
--- a/lib/std/special/compiler_rt/negXf2.zig
+++ b/lib/std/special/compiler_rt/negXf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn __negsf2(a: f32) callconv(.C) f32 {
diff --git a/lib/std/special/compiler_rt/popcountdi2.zig b/lib/std/special/compiler_rt/popcountdi2.zig
index b7e7220c7b..5bb49ce402 100644
--- a/lib/std/special/compiler_rt/popcountdi2.zig
+++ b/lib/std/special/compiler_rt/popcountdi2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/popcountdi2_test.zig b/lib/std/special/compiler_rt/popcountdi2_test.zig
index fe02786e15..6ea181bf0e 100644
--- a/lib/std/special/compiler_rt/popcountdi2_test.zig
+++ b/lib/std/special/compiler_rt/popcountdi2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __popcountdi2 = @import("popcountdi2.zig").__popcountdi2;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/shift.zig b/lib/std/special/compiler_rt/shift.zig
index f811c5124d..1609cb115c 100644
--- a/lib/std/special/compiler_rt/shift.zig
+++ b/lib/std/special/compiler_rt/shift.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const Log2Int = std.math.Log2Int;
diff --git a/lib/std/special/compiler_rt/stack_probe.zig b/lib/std/special/compiler_rt/stack_probe.zig
index dd441b2f32..58cce9fb6f 100644
--- a/lib/std/special/compiler_rt/stack_probe.zig
+++ b/lib/std/special/compiler_rt/stack_probe.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 // Zig's own stack-probe routine (available only on x86 and x86_64)
diff --git a/lib/std/special/compiler_rt/truncXfYf2.zig b/lib/std/special/compiler_rt/truncXfYf2.zig
index d345bf30a3..e096e7e4f0 100644
--- a/lib/std/special/compiler_rt/truncXfYf2.zig
+++ b/lib/std/special/compiler_rt/truncXfYf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn __truncsfhf2(a: f32) callconv(.C) u16 {
diff --git a/lib/std/special/compiler_rt/truncXfYf2_test.zig b/lib/std/special/compiler_rt/truncXfYf2_test.zig
index baec2a4450..048005f86d 100644
--- a/lib/std/special/compiler_rt/truncXfYf2_test.zig
+++ b/lib/std/special/compiler_rt/truncXfYf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __truncsfhf2 = @import("truncXfYf2.zig").__truncsfhf2;
 
 fn test__truncsfhf2(a: u32, expected: u16) void {
diff --git a/lib/std/special/compiler_rt/udivmod.zig b/lib/std/special/compiler_rt/udivmod.zig
index ba53d1dee0..2836f34c85 100644
--- a/lib/std/special/compiler_rt/udivmod.zig
+++ b/lib/std/special/compiler_rt/udivmod.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 
diff --git a/lib/std/special/compiler_rt/udivmoddi4_test.zig b/lib/std/special/compiler_rt/udivmoddi4_test.zig
index 48a38faa04..74a4a828e8 100644
--- a/lib/std/special/compiler_rt/udivmoddi4_test.zig
+++ b/lib/std/special/compiler_rt/udivmoddi4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Disable formatting to avoid unnecessary source repository bloat.
 // zig fmt: off
 const __udivmoddi4 = @import("int.zig").__udivmoddi4;
diff --git a/lib/std/special/compiler_rt/udivmodti4.zig b/lib/std/special/compiler_rt/udivmodti4.zig
index cc1141dbbc..ff33a35680 100644
--- a/lib/std/special/compiler_rt/udivmodti4.zig
+++ b/lib/std/special/compiler_rt/udivmodti4.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmod = @import("udivmod.zig").udivmod;
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
diff --git a/lib/std/special/compiler_rt/udivmodti4_test.zig b/lib/std/special/compiler_rt/udivmodti4_test.zig
index fdeae7c02b..1852d5c7af 100644
--- a/lib/std/special/compiler_rt/udivmodti4_test.zig
+++ b/lib/std/special/compiler_rt/udivmodti4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Disable formatting to avoid unnecessary source repository bloat.
 // zig fmt: off
 const __udivmodti4 = @import("udivmodti4.zig").__udivmodti4;
diff --git a/lib/std/special/compiler_rt/udivti3.zig b/lib/std/special/compiler_rt/udivti3.zig
index 52afa0420f..187b4a1577 100644
--- a/lib/std/special/compiler_rt/udivti3.zig
+++ b/lib/std/special/compiler_rt/udivti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmodti4 = @import("udivmodti4.zig");
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/umodti3.zig b/lib/std/special/compiler_rt/umodti3.zig
index 29eb572892..3bc5be8ffc 100644
--- a/lib/std/special/compiler_rt/umodti3.zig
+++ b/lib/std/special/compiler_rt/umodti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmodti4 = @import("udivmodti4.zig");
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
diff --git a/lib/std/special/init-exe/build.zig b/lib/std/special/init-exe/build.zig
index fd71588c5f..db818cbe92 100644
--- a/lib/std/special/init-exe/build.zig
+++ b/lib/std/special/init-exe/build.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const Builder = @import("std").build.Builder;
 
 pub fn build(b: *Builder) void {
diff --git a/lib/std/special/init-exe/src/main.zig b/lib/std/special/init-exe/src/main.zig
index d29869ff88..e4b2e7d8ec 100644
--- a/lib/std/special/init-exe/src/main.zig
+++ b/lib/std/special/init-exe/src/main.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn main() anyerror!void {
diff --git a/lib/std/special/init-lib/build.zig b/lib/std/special/init-lib/build.zig
index 558e447c15..edc8a0215d 100644
--- a/lib/std/special/init-lib/build.zig
+++ b/lib/std/special/init-lib/build.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const Builder = @import("std").build.Builder;
 
 pub fn build(b: *Builder) void {
diff --git a/lib/std/special/init-lib/src/main.zig b/lib/std/special/init-lib/src/main.zig
index 747bb08573..9a82bcc26b 100644
--- a/lib/std/special/init-lib/src/main.zig
+++ b/lib/std/special/init-lib/src/main.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const testing = std.testing;
 
diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index 4267151638..87b011ede8 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const io = std.io;
 const builtin = @import("builtin");
diff --git a/lib/std/spinlock.zig b/lib/std/spinlock.zig
index 0af08e9a84..d72ac14ecf 100644
--- a/lib/std/spinlock.zig
+++ b/lib/std/spinlock.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 
diff --git a/lib/std/start.zig b/lib/std/start.zig
index 811e05012f..2b1bae060e 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file is included in the compilation unit when exporting an executable.
 
 const root = @import("root");
diff --git a/lib/std/start_windows_tls.zig b/lib/std/start_windows_tls.zig
index f6dd2bc132..18c016d206 100644
--- a/lib/std/start_windows_tls.zig
+++ b/lib/std/start_windows_tls.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 
diff --git a/lib/std/std.zig b/lib/std/std.zig
index 940fc498d6..2ff44f5e41 100644
--- a/lib/std/std.zig
+++ b/lib/std/std.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const ArrayList = @import("array_list.zig").ArrayList;
 pub const ArrayListAligned = @import("array_list.zig").ArrayListAligned;
 pub const ArrayListAlignedUnmanaged = @import("array_list.zig").ArrayListAlignedUnmanaged;
diff --git a/lib/std/target.zig b/lib/std/target.zig
index 14cea9dd57..b162bdd0c3 100644
--- a/lib/std/target.zig
+++ b/lib/std/target.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const mem = std.mem;
 const builtin = std.builtin;
diff --git a/lib/std/target/aarch64.zig b/lib/std/target/aarch64.zig
index 9af95dfada..0f64b2fd69 100644
--- a/lib/std/target/aarch64.zig
+++ b/lib/std/target/aarch64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/amdgpu.zig b/lib/std/target/amdgpu.zig
index 4b3f83bbc3..9fa52c317d 100644
--- a/lib/std/target/amdgpu.zig
+++ b/lib/std/target/amdgpu.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/arm.zig b/lib/std/target/arm.zig
index 90b060c03f..e96a9aa4e6 100644
--- a/lib/std/target/arm.zig
+++ b/lib/std/target/arm.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/avr.zig b/lib/std/target/avr.zig
index af4f5ba5be..3ad603eabe 100644
--- a/lib/std/target/avr.zig
+++ b/lib/std/target/avr.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/bpf.zig b/lib/std/target/bpf.zig
index ddb12d3d85..5e23c233c8 100644
--- a/lib/std/target/bpf.zig
+++ b/lib/std/target/bpf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/hexagon.zig b/lib/std/target/hexagon.zig
index f429099d88..c5eac1886f 100644
--- a/lib/std/target/hexagon.zig
+++ b/lib/std/target/hexagon.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/mips.zig b/lib/std/target/mips.zig
index fc95b2dee8..6d82caf0c0 100644
--- a/lib/std/target/mips.zig
+++ b/lib/std/target/mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/msp430.zig b/lib/std/target/msp430.zig
index 947137b3e2..38ea358f90 100644
--- a/lib/std/target/msp430.zig
+++ b/lib/std/target/msp430.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/nvptx.zig b/lib/std/target/nvptx.zig
index d719a6bb71..1282c48e1a 100644
--- a/lib/std/target/nvptx.zig
+++ b/lib/std/target/nvptx.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/powerpc.zig b/lib/std/target/powerpc.zig
index 19b050c5bd..e13e3dd97f 100644
--- a/lib/std/target/powerpc.zig
+++ b/lib/std/target/powerpc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/riscv.zig b/lib/std/target/riscv.zig
index dbdb107024..9d4429bd5c 100644
--- a/lib/std/target/riscv.zig
+++ b/lib/std/target/riscv.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/sparc.zig b/lib/std/target/sparc.zig
index e1cbc845fc..8baac12635 100644
--- a/lib/std/target/sparc.zig
+++ b/lib/std/target/sparc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/systemz.zig b/lib/std/target/systemz.zig
index f065a8b169..4f3415626c 100644
--- a/lib/std/target/systemz.zig
+++ b/lib/std/target/systemz.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/wasm.zig b/lib/std/target/wasm.zig
index 72b2b6d431..3021834ec4 100644
--- a/lib/std/target/wasm.zig
+++ b/lib/std/target/wasm.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/x86.zig b/lib/std/target/x86.zig
index bfcd1abc1a..61219e13b0 100644
--- a/lib/std/target/x86.zig
+++ b/lib/std/target/x86.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index 27026149bc..658d31bb82 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const print = std.debug.print;
 
diff --git a/lib/std/testing/failing_allocator.zig b/lib/std/testing/failing_allocator.zig
index d8b243d0fa..61912e6933 100644
--- a/lib/std/testing/failing_allocator.zig
+++ b/lib/std/testing/failing_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 
diff --git a/lib/std/thread.zig b/lib/std/thread.zig
index 3d20f54558..d73907690e 100644
--- a/lib/std/thread.zig
+++ b/lib/std/thread.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/time.zig b/lib/std/time.zig
index 6a0b9a13aa..ae128f6b0c 100644
--- a/lib/std/time.zig
+++ b/lib/std/time.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/time/epoch.zig b/lib/std/time/epoch.zig
index 126c4fceb7..3a42c85a6d 100644
--- a/lib/std/time/epoch.zig
+++ b/lib/std/time/epoch.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! Epoch reference times in terms of their difference from
 //! UTC 1970-01-01 in seconds.
 
diff --git a/lib/std/unicode.zig b/lib/std/unicode.zig
index 2c88d2ba0c..86b805b892 100644
--- a/lib/std/unicode.zig
+++ b/lib/std/unicode.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("./std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/unicode/throughput_test.zig b/lib/std/unicode/throughput_test.zig
index 050340cd55..e59953a21f 100644
--- a/lib/std/unicode/throughput_test.zig
+++ b/lib/std/unicode/throughput_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/valgrind.zig b/lib/std/valgrind.zig
index 38c4a491e0..5373a2d513 100644
--- a/lib/std/valgrind.zig
+++ b/lib/std/valgrind.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const math = std.math;
diff --git a/lib/std/valgrind/callgrind.zig b/lib/std/valgrind/callgrind.zig
index 82725e9103..5e025c4ffe 100644
--- a/lib/std/valgrind/callgrind.zig
+++ b/lib/std/valgrind/callgrind.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const valgrind = std.valgrind;
 
diff --git a/lib/std/valgrind/memcheck.zig b/lib/std/valgrind/memcheck.zig
index e0aefa7d5f..449b4c4a46 100644
--- a/lib/std/valgrind/memcheck.zig
+++ b/lib/std/valgrind/memcheck.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const valgrind = std.valgrind;
diff --git a/lib/std/zig.zig b/lib/std/zig.zig
index ab6895e1bf..34e03eb164 100644
--- a/lib/std/zig.zig
+++ b/lib/std/zig.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const tokenizer = @import("zig/tokenizer.zig");
 
diff --git a/lib/std/zig/ast.zig b/lib/std/zig/ast.zig
index f5149e3a82..f6ba29a9ef 100644
--- a/lib/std/zig/ast.zig
+++ b/lib/std/zig/ast.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/zig/cross_target.zig b/lib/std/zig/cross_target.zig
index 5466b39f0b..75fc5969a5 100644
--- a/lib/std/zig/cross_target.zig
+++ b/lib/std/zig/cross_target.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const Target = std.Target;
diff --git a/lib/std/zig/parse.zig b/lib/std/zig/parse.zig
index e0eb2dd895..2af2ee4a45 100644
--- a/lib/std/zig/parse.zig
+++ b/lib/std/zig/parse.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
diff --git a/lib/std/zig/parser_test.zig b/lib/std/zig/parser_test.zig
index 87807255b0..8259af32a6 100644
--- a/lib/std/zig/parser_test.zig
+++ b/lib/std/zig/parser_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 test "zig fmt: convert var to anytype" {
     // TODO remove in next release cycle
     try testTransform(
diff --git a/lib/std/zig/perf_test.zig b/lib/std/zig/perf_test.zig
index 689fea96f6..30ae99e57c 100644
--- a/lib/std/zig/perf_test.zig
+++ b/lib/std/zig/perf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const warn = std.debug.warn;
diff --git a/lib/std/zig/render.zig b/lib/std/zig/render.zig
index 7b9036f259..4d44c41bfa 100644
--- a/lib/std/zig/render.zig
+++ b/lib/std/zig/render.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/zig/string_literal.zig b/lib/std/zig/string_literal.zig
index 560a233723..ca3585944e 100644
--- a/lib/std/zig/string_literal.zig
+++ b/lib/std/zig/string_literal.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 
diff --git a/lib/std/zig/system.zig b/lib/std/zig/system.zig
index be47da46bb..175b0e4555 100644
--- a/lib/std/zig/system.zig
+++ b/lib/std/zig/system.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const elf = std.elf;
 const mem = std.mem;
diff --git a/lib/std/zig/system/macos.zig b/lib/std/zig/system/macos.zig
index dd34fe26f9..e0e69b6b8b 100644
--- a/lib/std/zig/system/macos.zig
+++ b/lib/std/zig/system/macos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn version_from_build(build: []const u8) !std.builtin.Version {
diff --git a/lib/std/zig/system/x86.zig b/lib/std/zig/system/x86.zig
index b4964596d2..cbede308dc 100644
--- a/lib/std/zig/system/x86.zig
+++ b/lib/std/zig/system/x86.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const Target = std.Target;
 const CrossTarget = std.zig.CrossTarget;
diff --git a/lib/std/zig/tokenizer.zig b/lib/std/zig/tokenizer.zig
index 7f9c6f6288..47c7d23b35 100644
--- a/lib/std/zig/tokenizer.zig
+++ b/lib/std/zig/tokenizer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 
diff --git a/test/stack_traces.zig b/test/stack_traces.zig
index 616136b9ee..2ab022e6ec 100644
--- a/test/stack_traces.zig
+++ b/test/stack_traces.zig
@@ -282,10 +282,10 @@ pub fn addCases(cases: *tests.StackTracesContext) void {
                     \\source.zig:10:8: [address] in main (test)
                     \\    foo();
                     \\       ^
-                    \\start.zig:249:29: [address] in std.start.posixCallMainAndExit (test)
+                    \\start.zig:254:29: [address] in std.start.posixCallMainAndExit (test)
                     \\            return root.main();
                     \\                            ^
-                    \\start.zig:123:5: [address] in std.start._start (test)
+                    \\start.zig:128:5: [address] in std.start._start (test)
                     \\    @call(.{ .modifier = .never_inline }, posixCallMainAndExit, .{});
                     \\    ^
                     \\
@@ -294,7 +294,7 @@ pub fn addCases(cases: *tests.StackTracesContext) void {
                 switch (std.Target.current.cpu.arch) {
                     .aarch64 => "", // TODO disabled; results in segfault
                     else => 
-                \\start.zig:123:5: [address] in std.start._start (test)
+                \\start.zig:128:5: [address] in std.start._start (test)
                     \\    @call(.{ .modifier = .never_inline }, posixCallMainAndExit, .{});
                     \\    ^
                     \\