diff --git a/poky/scripts/gen-lockedsig-cache b/poky/scripts/gen-lockedsig-cache
index 6765891..e3076e1 100755
--- a/poky/scripts/gen-lockedsig-cache
+++ b/poky/scripts/gen-lockedsig-cache
@@ -1,4 +1,7 @@
 #!/usr/bin/env python3
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
 
 import os
 import sys