diff --git a/ShadowsocksX-NG/PreferencesWindowController.swift b/ShadowsocksX-NG/PreferencesWindowController.swift
index 51e405f..f9e8723 100644
--- a/ShadowsocksX-NG/PreferencesWindowController.swift
+++ b/ShadowsocksX-NG/PreferencesWindowController.swift
@@ -124,6 +124,7 @@ class PreferencesWindowController: NSWindowController
     @IBAction func ok(sender: NSButton) {
         if editingProfile != nil {
             if !editingProfile.isValid() {
+                // Done Shake window
                 shakeWindows()
                 return
             }