diff --git a/include/FramelessHelper/Core/framelesshelper_windows.h b/include/FramelessHelper/Core/framelesshelper_windows.h
index 2e336d6..abb98c0 100644
--- a/include/FramelessHelper/Core/framelesshelper_windows.h
+++ b/include/FramelessHelper/Core/framelesshelper_windows.h
@@ -22,6 +22,9 @@
  * SOFTWARE.
  */
 
+// Copyright (C) Microsoft Corporation.
+// Licensed under the MIT license.
+
 #pragma once
 
 #ifndef WIN32_LEAN_AND_MEAN