diff --git a/osbase/net/dump/hwaddr_compat.go b/osbase/net/dump/hwaddr_compat.go
index 07067bf..7c952a5 100644
--- a/osbase/net/dump/hwaddr_compat.go
+++ b/osbase/net/dump/hwaddr_compat.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package netdump
 
 import (