diff --git a/init/Makefile b/init/Makefile
index c4fb455..1dbb237 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for the linux kernel.
 #