diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile
index 92c3bd9..fbe5e79 100644
--- a/arch/sh/mm/Makefile
+++ b/arch/sh/mm/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the Linux SuperH-specific parts of the memory manager.
 #