diff --git a/poky/scripts/buildhistory-diff b/poky/scripts/buildhistory-diff
index 70805b0..833f7c3 100755
--- a/poky/scripts/buildhistory-diff
+++ b/poky/scripts/buildhistory-diff
@@ -4,6 +4,9 @@
 #
 # Copyright (C) 2013 Intel Corporation
 # Author: Paul Eggleton <paul.eggleton@linux.intel.com>
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
 
 import sys
 import os