diff --git a/osbase/logtree/kmsg_test.go b/osbase/logtree/kmsg_test.go
index 24f2acf..ff97a6d 100644
--- a/osbase/logtree/kmsg_test.go
+++ b/osbase/logtree/kmsg_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 //go:build linux
 // +build linux