diff --git a/poky/bitbake/lib/bb/compat.py b/poky/bitbake/lib/bb/compat.py
index de1923d..4935668 100644
--- a/poky/bitbake/lib/bb/compat.py
+++ b/poky/bitbake/lib/bb/compat.py
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
 """Code pulled from future python versions, here for compatibility"""
 
 from collections import MutableMapping, KeysView, ValuesView, ItemsView, OrderedDict