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diff --git a/doc/CODING_STYLE.md b/doc/CODING_STYLE.md
index ba3fcb5..7d45027 100644
--- a/doc/CODING_STYLE.md
+++ b/doc/CODING_STYLE.md
@@ -166,6 +166,24 @@ Three-line header for all source files.
 
 ## WGSL Shader Style
 
+### File Header (Required)
+
+Every `.wgsl` file must start with a 2-line comment header:
+
+```wgsl
+// Line 1: What the shader/snippet does (one sentence).
+// Line 2: Role, main outputs, or public API surface.
+```
+
+Example:
+```wgsl
+// NTSC post-process effect: fisheye distortion, scanlines, and color bleeding.
+// Produces a retro CRT/NTSC look using YIQ color space and C64-style dithering.
+```
+
+---
+
+
 ### Return vs Pointer Parameters
 
 **Rule:** Prefer return values over pointer parameters for small structs (≤16 bytes).