diff --git a/documentation/migration-guides/release-notes-4.0.9.rst b/documentation/migration-guides/release-notes-4.0.9.rst
index 883514e686..7c35b85810 100644
--- a/documentation/migration-guides/release-notes-4.0.9.rst
+++ b/documentation/migration-guides/release-notes-4.0.9.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
 Release notes for Yocto-4.0.9 (Kirkstone)
 -----------------------------------------