diff --git a/go/qcow2/qcow2_test.go b/go/qcow2/qcow2_test.go
index cff77ac..2d7491b 100644
--- a/go/qcow2/qcow2_test.go
+++ b/go/qcow2/qcow2_test.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package qcow2
 
 import (