diff --git a/components/style/element_state.rs b/components/style/element_state.rs
index ef6e9704170..9ccd08334cc 100644
--- a/components/style/element_state.rs
+++ b/components/style/element_state.rs
@@ -4,6 +4,8 @@
 
 //! States elements can be in.
 
+#![deny(missing_docs)]
+
 bitflags! {
     #[doc = "Event-based element states."]
     #[cfg_attr(feature = "servo", derive(HeapSizeOf))]