diff --git a/src/compare_elements.rs b/src/compare_elements.rs
index d133c85..85c81e7 100644
--- a/src/compare_elements.rs
+++ b/src/compare_elements.rs
@@ -1,3 +1,9 @@
+// Copyright (c) 2017 Astro <astro@spaceboyz.net>
+//
+// 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/.
+
 use minidom::{Node, Element};
 
 pub trait NamespaceAwareCompare {