diff --git a/internal/feedback/lockdiff.go b/internal/feedback/lockdiff.go
index d7fe5352..f17dd05b 100644
--- a/internal/feedback/lockdiff.go
+++ b/internal/feedback/lockdiff.go
@@ -1,3 +1,7 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package feedback
 
 import (