diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 9357e37fd7c..cb7829a7b87 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -3149,7 +3149,7 @@ nsCSSFrameConstructor::ConstructFieldSetFrame(nsFrameConstructorState& aState,
 
   newFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT);
 
-  // our new frame returned is the top frame which is the list frame. 
+  // Our new frame returned is the outer frame, which is the fieldset frame.
   *aNewFrame = newFrame; 
 
   return NS_OK;