diff --git a/content/h2push/server/main.go b/content/h2push/server/main.go
index 5cc153a..8eb842a 100644
--- a/content/h2push/server/main.go
+++ b/content/h2push/server/main.go
@@ -1,4 +1,10 @@
-// server is a server with HTTP/2 Server Push support.
+// Copyright 2017 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.
+
+// +build go1.8
+
+// The server command demonstrates a server with HTTP/2 Server Push support.
 package main
 
 import (