diff --git a/components/style/gecko/mod.rs b/components/style/gecko/mod.rs
index 7f227f154dc..0e49405d159 100644
--- a/components/style/gecko/mod.rs
+++ b/components/style/gecko/mod.rs
@@ -2,6 +2,7 @@
  * 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/. */
 
+//! Gecko-specific style-system bits.
 
 pub mod data;
 pub mod restyle_damage;