diff --git a/net/DownloadHelper/README.md b/net/DownloadHelper/README.md
index 708d2b3..6d13323 100644
--- a/net/DownloadHelper/README.md
+++ b/net/DownloadHelper/README.md
@@ -8,7 +8,7 @@ files servered by nginx (https with basic auth) => mirrors (nginx proxy) =>
 index2list.py(copy generated links) => webui-aria2(local aria2c) => HDD/SSD
 ```
 
-python requests SNI support:
+**python requests SNI support:**
 
 ```
 pip install pyOpenSSL
@@ -16,3 +16,13 @@ pip install ndg-httpsclient
 pip install pyasn1
 ```
 
+**nginx proxy config exmaple**
+
+I suggest you set `proxy_buffering` `off`, otherwise mirrors will use huge bandwidth to cache files.
+
+```
+location /downloads/ {
+    proxy_buffering off;
+    proxy_pass https://www.xxx.com/downloads/;
+}
+```