diff --git a/EventHook/Hooks/ShellHook.cs b/EventHook/Hooks/ShellHook.cs
index 310e647..8a18080 100644
--- a/EventHook/Hooks/ShellHook.cs
+++ b/EventHook/Hooks/ShellHook.cs
@@ -6,6 +6,7 @@ namespace EventHook.Hooks
 {
     internal delegate void GeneralShellHookEventHandler(ShellHook sender, IntPtr hWnd);
 
+    //https://github.com/lemkepf/ClipHub/blob/master/ClipHub/ClipHub/Code/Helpers/ShellHook.cs
     internal sealed class ShellHook : NativeWindow
     {
         private readonly uint _wmShellHook;
@@ -136,4 +137,4 @@ private static int GetWindowLong(IntPtr hWnd, int nIndex)
 
         #endregion
     }
-}
\ No newline at end of file
+}