diff --git a/demo_test/vendor/github.com/golang/protobuf/ptypes/doc.go b/demo_test/vendor/github.com/golang/protobuf/ptypes/doc.go
new file mode 100644
index 0000000..fb9edd5
--- /dev/null
+++ b/demo_test/vendor/github.com/golang/protobuf/ptypes/doc.go
@@ -0,0 +1,6 @@
+// Copyright 2016 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 ptypes provides functionality for interacting with well-known types.
+package ptypes