diff --git a/go/net/tinylb/connection_pool.go b/go/net/tinylb/connection_pool.go
index 405dd1d..53b0167 100644
--- a/go/net/tinylb/connection_pool.go
+++ b/go/net/tinylb/connection_pool.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package tinylb
 
 import (