diff --git a/bitunpack_.h b/bitunpack_.h
index e976f21..0239bce 100644
--- a/bitunpack_.h
+++ b/bitunpack_.h
@@ -1,6 +1,6 @@
 /**
   Copyright (C) powturbo 2013-2023
-  GPL v2 License
+  SPDX-License-Identifier: GPL v2 License
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by