diff --git a/mozilla/xpcom/threads/plevent.c b/mozilla/xpcom/threads/plevent.c
index 8ac5f161496..2073f943b6b 100644
--- a/mozilla/xpcom/threads/plevent.c
+++ b/mozilla/xpcom/threads/plevent.c
@@ -918,7 +918,7 @@ _pl_CleanupNativeNotifier(PLEventQueue* self)
     }
     RemoveProp(self->eventReceiverWindow, _md_GetEventQueuePropName());
 
-    // DestroyWindow doesn't do anything when called a non ui thread.  Since 
+    // DestroyWindow doesn't do anything when called from a non ui thread.  Since 
     // self->eventReceiverWindow was created on the ui thread, it must be destroyed
     // on the ui thread.
     SendMessage(self->eventReceiverWindow, WM_CLOSE, 0, 0);