diff --git a/poky/meta/lib/oe/classutils.py b/poky/meta/lib/oe/classutils.py
index 45cd524..08bb66b 100644
--- a/poky/meta/lib/oe/classutils.py
+++ b/poky/meta/lib/oe/classutils.py
@@ -1,3 +1,6 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
 
 class ClassRegistryMeta(type):
     """Give each ClassRegistry their own registry"""