diff --git a/app/src/main/res/drawable/simple_dark_grey_gradient.xml b/app/src/main/res/drawable/simple_dark_grey_gradient.xml
index 58a5b3df5..d89844b3c 100644
--- a/app/src/main/res/drawable/simple_dark_grey_gradient.xml
+++ b/app/src/main/res/drawable/simple_dark_grey_gradient.xml
@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- 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/. -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item>
         <shape>