diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile
index 6bea3d3..950e680 100644
--- a/arch/arm/cpu/Makefile
+++ b/arch/arm/cpu/Makefile
@@ -1 +1,5 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 obj- += dummy.o