diff --git a/src/shader.ts b/src/shader.ts
index 05919b7..434ec43 100644
--- a/src/shader.ts
+++ b/src/shader.ts
@@ -1,3 +1,9 @@
+/*!
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 import { Renderer } from "./oktaeder";
 
 export type ShaderFlagKey = number;