diff --git a/components/layout_thread/lib.rs b/components/layout_thread/lib.rs
index 9b6e801979b..190f79d8d05 100644
--- a/components/layout_thread/lib.rs
+++ b/components/layout_thread/lib.rs
@@ -789,6 +789,7 @@ impl LayoutThread {
                 self.prepare_to_exit(response_chan);
                 return false;
             },
+            // Receiving the Exit message at this stage only happens when layout is undergoing a "force exit".
             Msg::ExitNow => {
                 debug!("layout: ExitNow received");
                 self.exit_now();