diff --git a/osbase/kmod/radix.go b/osbase/kmod/radix.go
index 1631d87..19898f1 100644
--- a/osbase/kmod/radix.go
+++ b/osbase/kmod/radix.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package kmod
 
 import (