From a0648ee449335ba4989a83230874089b8685e3ad Mon Sep 17 00:00:00 2001
From: dangqingqing <dangqingqing@baidu.com>
Date: Thu, 30 Nov 2017 20:37:23 +0800
Subject: [PATCH] Add comments.

---
 cmake/external/protobuf.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cmake/external/protobuf.cmake b/cmake/external/protobuf.cmake
index 7ae0b16b08f..fab2af362bb 100644
--- a/cmake/external/protobuf.cmake
+++ b/cmake/external/protobuf.cmake
@@ -191,6 +191,8 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
     SET(PROTOBUF_REPO "https://github.com/google/protobuf.git")
     SET(PROTOBUF_TAG "9f75c5aa851cd877fb0d93ccc31b8567a6706546")
     IF(MOBILE_INFERENCE)
+        # The reason why the official version is not used is described in
+        # https://github.com/PaddlePaddle/Paddle/issues/6114
         SET(PROTOBUF_REPO "https://github.com/qingqing01/protobuf.git")
         SET(PROTOBUF_TAG "v3.2.0")
         IF(NOT BUILD_FOR_HOST)
-- 
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