diff --git a/minidom/src/tree_builder.rs b/minidom/src/tree_builder.rs
index 2da276debfa5b1607f782467c793f2a4a4a25155..0e36b050bc33a769366ebb990ca06580dc420de9 100644
--- a/minidom/src/tree_builder.rs
+++ b/minidom/src/tree_builder.rs
@@ -1,4 +1,8 @@
 // Copyright (c) 2022 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/.
 
 //! SAX events to DOM tree conversion