diff --git a/net/rose/Makefile b/net/rose/Makefile
index fa24811..3e6638f 100644
--- a/net/rose/Makefile
+++ b/net/rose/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Makefile for the Linux Rose (X.25 PLP) layer.
 #