diff --git a/go/qcow2/qcow2.go b/go/qcow2/qcow2.go
index df7825f..f10b4eb 100644
--- a/go/qcow2/qcow2.go
+++ b/go/qcow2/qcow2.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 // Package qcow2 implements generating QEMU copy-on-write image files.
 package qcow2