diff --git a/scripts/imgtool/version.py b/scripts/imgtool/version.py
index 8910e0b..6e38f44 100644
--- a/scripts/imgtool/version.py
+++ b/scripts/imgtool/version.py
@@ -1,5 +1,7 @@
 # Copyright 2017 Linaro Limited
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at