diff --git a/chrome/browser/permissions/permission_request.h b/chrome/browser/permissions/permission_request.h
index 6e4db4a..b7b1ec4 100644
--- a/chrome/browser/permissions/permission_request.h
+++ b/chrome/browser/permissions/permission_request.h
@@ -131,6 +131,9 @@
   // It is safe for the request to be deleted at this point -- it will receive
   // no further message from the permission request system. This method will
   // eventually be called on every request which is not unregistered.
+  // It is ok to call this method without actually resolving the request via
+  // PermissionGranted(), PermissionDenied() or Canceled(). However, it will not
+  // resolve the javascript promise from the requesting origin.
   virtual void RequestFinished() = 0;
 
   // Used to record UMA metrics for permission requests.