diff --git a/pkg/netutil/doc.go b/pkg/netutil/doc.go
new file mode 100644
index 000000000..5d92d03a6
--- /dev/null
+++ b/pkg/netutil/doc.go
@@ -0,0 +1,16 @@
+// Copyright 2018 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package netutil implements network-related utility functions.
+package netutil
diff --git a/pkg/netutil/netutil.go b/pkg/netutil/netutil.go
index c2da933e0..52373bd06 100644
--- a/pkg/netutil/netutil.go
+++ b/pkg/netutil/netutil.go
@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package netutil implements network-related utility functions.
 package netutil
 
 import (