diff --git a/net/DownloadHelper/README.md b/net/DownloadHelper/README.md
index 3d334a5..708d2b3 100644
--- a/net/DownloadHelper/README.md
+++ b/net/DownloadHelper/README.md
@@ -1,7 +1,18 @@
 ###DownloadHelper###
 
-SNI problem:
+This can convert nginx auto index page to download links for aria2c, can add mirrors(nginx proxy) to the link too.
+
+
+```
+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:
+
+```
+pip install pyOpenSSL
+pip install ndg-httpsclient
+pip install pyasn1
+```
 
-`pip install pyOpenSSL`
-`pip install ndg-httpsclient`
-`pip install pyasn1`
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