diff --git a/doc/copyright.texi b/doc/copyright.texi
index 99e9d5a5a..64ed4ea6e 100644
--- a/doc/copyright.texi
+++ b/doc/copyright.texi
@@ -322,6 +322,7 @@ WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 Windows support
 
 @verbatim
+SPDX-License-Identifier: BSD-2-Clause
 
 Copyright (c) 2009-2015, Secure Endpoints Inc.
 All rights reserved.