diff --git a/go/logging/backend.go b/go/logging/backend.go
index 2fe4556..19c1bab 100644
--- a/go/logging/backend.go
+++ b/go/logging/backend.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package logging
 
 import (