diff --git a/src/components/script/style/mod.rs b/src/components/script/style/mod.rs
index 8ed3bf918f7..f243ef0feb8 100644
--- a/src/components/script/style/mod.rs
+++ b/src/components/script/style/mod.rs
@@ -1,3 +1,7 @@
+/* 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/. */
+
 pub mod stylesheets;
 pub mod errors;
 pub mod selectors;