diff --git a/components/style/gecko_bindings/sugar/ns_com_ptr.rs b/components/style/gecko_bindings/sugar/ns_com_ptr.rs
index a7056320a5a..c7ad3af5e35 100644
--- a/components/style/gecko_bindings/sugar/ns_com_ptr.rs
+++ b/components/style/gecko_bindings/sugar/ns_com_ptr.rs
@@ -1,15 +1,20 @@
 /* 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/. */
+
+//! Little helpers for `nsCOMPtr`.
+
 use gecko_bindings::structs::nsCOMPtr;
 
 impl<T> nsCOMPtr<T> {
+    /// Get this pointer as a raw pointer.
     #[cfg(debug_assertions)]
     #[inline]
     pub fn raw(&self) -> *mut T {
         self.mRawPtr
     }
 
+    /// Get this pointer as a raw pointer.
     #[cfg(not(debug_assertions))]
     #[inline]
     pub fn raw(&self) -> *mut T {