diff --git a/poky/meta/lib/oe/packagegroup.py b/poky/meta/lib/oe/packagegroup.py
index 4bc5d3e..2419cbb 100644
--- a/poky/meta/lib/oe/packagegroup.py
+++ b/poky/meta/lib/oe/packagegroup.py
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 import itertools
 
 def is_optional(feature, d):