diff --git a/fs/kernfs/Makefile b/fs/kernfs/Makefile
index 674337c..4ca54ff 100644
--- a/fs/kernfs/Makefile
+++ b/fs/kernfs/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Makefile for the kernfs pseudo filesystem
 #