diff --git a/go/net/ssh/ssh_client.go b/go/net/ssh/ssh_client.go
index d0a0518..73974d3 100644
--- a/go/net/ssh/ssh_client.go
+++ b/go/net/ssh/ssh_client.go
@@ -1,3 +1,6 @@
+// Copyright The Monogon Project Authors.
+// SPDX-License-Identifier: Apache-2.0
+
 package ssh
 
 import (