From 45eb94e61f1386fb39d9c5f10443da563c4fc0f8 Mon Sep 17 00:00:00 2001
From: weixing02 <564445201@qq.com>
Date: Thu, 15 Mar 2018 11:04:46 +0800
Subject: [PATCH] Add comments

---
 Dockerfile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Dockerfile b/Dockerfile
index c4de740559..fbec88c796 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -53,6 +53,10 @@ RUN localedef -i en_US -f UTF-8 en_US.UTF-8
 
 # FIXME: due to temporary ipykernel dependency issue, specify ipykernel jupyter
 # version util jupyter fixes this issue.
+
+# specify sphinx version as 1.5.6 and remove -U option for [pip install -U
+# sphinx-rtd-theme] since -U option will cause sphinx being updated to newest
+# version(1.7.1 for now), which causes building documentation failed.
 RUN pip install --upgrade pip && \
     pip install -U wheel && \
     pip install -U docopt PyYAML sphinx==1.5.6 && \
-- 
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