From 53bc95314ccbbc3eadfd3719da76c43070e2cb77 Mon Sep 17 00:00:00 2001
From: Fengyuan Chen <cfy1990@gmail.com>
Date: Thu, 24 Sep 2015 21:46:34 +0800
Subject: [PATCH] add proxy usage note

---
 README.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/README.md b/README.md
index 31fe653a..d915db4f 100644
--- a/README.md
+++ b/README.md
@@ -220,6 +220,9 @@ easy to fork and contribute any changes back upstream.
 
    **NOTE:** If you need to pass configure option to build, please use
    ```CONFIGURE_OPTS``` environment variable.
+   
+   **NOTE:** If you want to use proxy to download, please use `http_proxy` and `https_proxy`
+   environment variable.
 
    **NOTE:** If you are having trouble installing a python version,
    please visit the wiki page about