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diff --git a/src/google/protobuf/io/package_info.h b/src/google/protobuf/io/package_info.h
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+++ b/src/google/protobuf/io/package_info.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.
+// http://code.google.com/p/protobuf/
+//
+// 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.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// This file exists solely to document the google::protobuf::io namespace.
+// It is not compiled into anything, but it may be read by an automated
+// documentation generator.
+
+namespace google {
+
+namespace protobuf {
+
+// Auxiliary classes used for I/O.
+//
+// The Protocol Buffer library uses the classes in this package to deal with
+// I/O and encoding/decoding raw bytes.  Most users will not need to
+// deal with this package.  However, users who want to adapt the system to
+// work with their own I/O abstractions -- e.g., to allow Protocol Buffers
+// to be read from a different kind of input stream without the need for a
+// temporary buffer -- should take a closer look.
+namespace io {}
+
+}  // namespace protobuf
+}  // namespace google