diff --git a/mozilla/uriloader/exthandler/nsExternalProtocolHandler.cpp b/mozilla/uriloader/exthandler/nsExternalProtocolHandler.cpp
index a1f695ac5f3..292946e302e 100644
--- a/mozilla/uriloader/exthandler/nsExternalProtocolHandler.cpp
+++ b/mozilla/uriloader/exthandler/nsExternalProtocolHandler.cpp
@@ -325,6 +325,8 @@ NS_IMETHODIMP nsExtProtocolChannel::AsyncOpen(nsIStreamListener *listener, nsISu
     nsCOMPtr<nsIRunnable> event = new nsWebProtocolRedirect(mUrl, uriTemplate,
                                                             listener, ctxt, 
                                                             this);
+    // We don't check if |event| was successfully created because
+    // |NS_DispatchToCurrentThread| will do that for us.
     rv = NS_DispatchToCurrentThread(event);
     if (NS_SUCCEEDED(rv)) {
       return rv;