diff --git a/osbase/logtree/proto/gomod-generated-placeholder.go b/osbase/logtree/proto/gomod-generated-placeholder.go
index 92256db..5805fe0 100644
--- a/osbase/logtree/proto/gomod-generated-placeholder.go
+++ b/osbase/logtree/proto/gomod-generated-placeholder.go
@@ -1 +1,4 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package proto