diff --git a/scripts/imgtool.py b/scripts/imgtool.py
index 7861474..e29e224 100755
--- a/scripts/imgtool.py
+++ b/scripts/imgtool.py
@@ -2,6 +2,8 @@
 #
 # 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