diff --git a/src/components/script/dom/bindings/codegen/Event.webidl b/src/components/script/dom/bindings/codegen/Event.webidl
index 48af319ada0..f60fee5d785 100644
--- a/src/components/script/dom/bindings/codegen/Event.webidl
+++ b/src/components/script/dom/bindings/codegen/Event.webidl
@@ -1,3 +1,15 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/.
+ *
+ * For more information on this interface please see
+ * http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
 [Constructor(DOMString type, optional EventInit eventInitDict)]
 interface Event {
   readonly attribute DOMString type;