Update README.md

README.md

@@ -6,15 +6,16 @@ gdns much like dnsmasq or chinadns, but it can run on windows.
 Features
 ========
 
-support different domains use different upstream servers
+support different domains use different upstream dns servers
 
-support contact to the upstream server by tcp or udp
+support contact to the upstream dns server by tcp or udp
 
 support blacklist list to block the fake ip
 
 Install
 =======
 
+```bash
 # get the depended library
 go get github.com/miekg/dns
 go get github.com/vharitonsky/iniflags
@@ -26,11 +27,12 @@ Install
 # generate a sample config file
 ./gdns -dumpflags > dns.ini
     
-    # edit the dns.ini
+# edit the dns.ini and run, need root privileges to bind on port 53
 sudo ./gdns -config dns.ini
     
 # test it
 dig @localhost twitter.com
+```
 
 Arguments
 ===========
@@ -39,4 +41,14 @@ use `gdns -h` to show the command line arguments.
 
 all arguments can specialed in config file or in command line.
 
-this is a sample file in the config_sample directory.
+there is a sample file in the `config_sample/` directory.
+
+Third-part library
+==================
+use 
+[dns](https://github.com/miekg/dns)
+library to parse the dns message
+
+use
+[iniflags](https://github.com/vharitonsky/iniflags)
+library to process the command line arguments and the config file