diff --git a/components/style/traversal.rs b/components/style/traversal.rs
index 42aba19c30a..1f917aaee2a 100644
--- a/components/style/traversal.rs
+++ b/components/style/traversal.rs
@@ -374,7 +374,6 @@ pub trait DomTraversal<E: TElement> : Sync {
         parent: E,
         parent_data: &ElementData,
     ) -> bool {
-        // See the comment on `cascade_node` for why we allow this on Gecko.
         debug_assert!(cfg!(feature = "gecko") ||
                       parent.has_current_styles_for_traversal(parent_data, context.shared.traversal_flags));