diff --git a/servo/src/components/compositing/constellation.rs b/servo/src/components/compositing/constellation.rs
index a243bf4f3ee9..4d55b25f4f45 100644
--- a/servo/src/components/compositing/constellation.rs
+++ b/servo/src/components/compositing/constellation.rs
@@ -723,8 +723,7 @@ impl Constellation {
 
         for current_frame in self.current_frame().iter() {
             // Messages originating in the current frame are not navigations;
-            // TODO(tkuehn): In fact, this kind of message might be provably
-            // impossible to occur.
+            // they may come from a page load in a subframe.
             if current_frame.contains(pipeline_id) {
                 for frame in current_frame.iter() {
                     frame.pipeline.grant_paint_permission();