diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 9663a9a5..a328efa 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -653,7 +653,7 @@
   virtual void DispatchBeforeUnload(bool auto_cancel) = 0;
 
   // Attaches |inner_web_contents| to the container frame |render_frame_host|,
-  // which should be in this WebContents' FrameTree. This outer WebContents
+  // which must be in a FrameTree for this WebContents. This outer WebContents
   // takes ownership of |inner_web_contents|.
   // Note: |render_frame_host| will be swapped out and destroyed during the
   // process. Generally a frame same-process with its parent is the right choice