Update README.md

Author: clowwindy

README.md

@@ -3,7 +3,7 @@ ChinaDNS
 
 [![PyPI version]][PyPI] [![Build Status]][Travis CI]
 
-A DNS forwarder that filters bad IPs.
+A DNS forwarder that filters [bad IPs]. Quite useful if you live in China.
 
 Install
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@@ -75,6 +75,7 @@ Please visit [Issue Tracker]
 Mailing list: http://groups.google.com/group/shadowsocks
 
 
+[bad IPs]:         https://github.com/clowwindy/ChinaDNS-C/blob/master/iplist.txt
 [Build Status]:    https://img.shields.io/travis/clowwindy/ChinaDNS/master.svg?style=flat
 [ChinaDNS-C]:      https://github.com/clowwindy/ChinaDNS-C
 [Download]:        https://sourceforge.net/projects/chinadns/files/dist/