diff --git a/arch/nios2/dts/Makefile b/arch/nios2/dts/Makefile
index b40eca9..f22fabf 100644
--- a/arch/nios2/dts/Makefile
+++ b/arch/nios2/dts/Makefile
@@ -1,3 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
 dtb-y += $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%).dtb
 
 targets += $(dtb-y)