diff --git a/addon/src/index.js b/addon/src/index.js
index 9b8817da..5a6c3868 100644
--- a/addon/src/index.js
+++ b/addon/src/index.js
@@ -1,3 +1,6 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
 var self = require("sdk/self");
 var buttons = require('sdk/ui/button/action');
 var tabs = require('sdk/tabs');