diff --git a/osbase/blockdev/blockdev_linux_test.go b/osbase/blockdev/blockdev_linux_test.go
index 31aa827..9cbf027 100644
--- a/osbase/blockdev/blockdev_linux_test.go
+++ b/osbase/blockdev/blockdev_linux_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 //go:build linux
 
 package blockdev