diff --git a/boot/bootutil/src/caps.c b/boot/bootutil/src/caps.c
index a59a01d..56b5791 100644
--- a/boot/bootutil/src/caps.c
+++ b/boot/bootutil/src/caps.c
@@ -1,4 +1,6 @@
 /*
+ * SPDX-License-Identifier: Apache-2.0
+ *
  * Copyright (c) 2017 Linaro Limited
  *
  * Licensed under the Apache License, Version 2.0 (the "License");