diff --git a/build.zig b/build.zig
index a8d2f4b..a2a6def 100644
--- a/build.zig
+++ b/build.zig
@@ -247,6 +247,7 @@ pub fn build(b: *std.Build) !void {
 
     const docserver_run_step = b.step("run-docserver", "run the docserver");
     const docserver_run = b.addRunArtifact(docserver_exe);
+    docserver_run.addPrefixedDirectoryArg("--docs=", docs_obj.getEmittedBinDirectory());
     docserver_run_step.dependOn(&docserver_run.step);
     docserver_run_step.dependOn(docserver_step);
 
diff --git a/tools/docserver.zig b/tools/docserver.zig
index 85b5167..8e7cca7 100644
--- a/tools/docserver.zig
+++ b/tools/docserver.zig
@@ -26,6 +26,15 @@ pub fn main() !void {
         }
     }
 
+    const ext = "wasm";
+    var buf: [0xF]u8 = undefined;
+    @memcpy(buf[0..ext.len], ext);
+
+    const mimetype = "application/wasm";
+    const fio_mimetype = zap.fio.fiobj_str_new(mimetype[0..], mimetype.len);
+
+    zap.fio.http_mimetype_register(buf[0..ext.len], ext.len, fio_mimetype);
+
     var listener = zap.HttpListener.init(.{
         .port = port,
         .on_request = on_request,