diff --git a/AppKit/CPWindow/CPWindow.j b/AppKit/CPWindow/CPWindow.j
index 67b163387..07d9f38f4 100644
--- a/AppKit/CPWindow/CPWindow.j
+++ b/AppKit/CPWindow/CPWindow.j
@@ -175,6 +175,7 @@ CPWindowBelow                   = 2;
 CPWindowWillCloseNotification       = @"CPWindowWillCloseNotification";
 CPWindowDidBecomeMainNotification   = @"CPWindowDidBecomeMainNotification";
 CPWindowDidResignMainNotification   = @"CPWindowDidResignMainNotification";
+CPWindowDidResizeNotification       = @"CPWindowDidResizeNotification";
 CPWindowDidMoveNotification         = @"CPWindowDidMoveNotification";
 CPWindowWillBeginSheetNotification  = @"CPWindowWillBeginSheetNotification";
 CPWindowDidEndSheetNotification     = @"CPWindowDidEndSheetNotification";