Update README.

README.md

@@ -26,21 +26,16 @@ go get github.com/shadowsocks/shadowsocks-go/cmd/shadowsocks-local
 
 Both the server and client program will look for `config.json` in the current directory. You can use `-c` option to specify another configuration file.
 
-The configuration syntax is the same with [shadowsocks-nodejs](https://github.com/clowwindy/shadowsocks-nodejs/). You can download the sample [`config.json`](https://github.com/shadowsocks/shadowsocks-go/blob/master/config.json), change the following values:
+Configuration file is in json format and has the same syntax with [shadowsocks-nodejs](https://github.com/clowwindy/shadowsocks-nodejs/). You can download the sample [`config.json`](https://github.com/shadowsocks/shadowsocks-go/blob/master/config.json), change the following values:
 
 ```
 server          your server ip or hostname
 server_port     server port
 local_port      local socks5 proxy port
 password        a password used to encrypt transfer
-
 timeout         server option, in seconds
-port_password   server option, specify multiple ports and passwords to support multiple users
-cache_enctable  server option, store computed encryption table on disk to speedup server startup
 ```
 
-Given `port_password` option, server program will ignore `server_port` and `password` options.
-
 Run `shadowsocks-server` on your server. To run it in the background, run `shadowsocks-server > log &`.
 
 On client, run `shadowsocks-local`. Change proxy settings of your browser to
@@ -60,12 +55,30 @@ shadowsocks-server -p server_port -k password -t timeout -c config.json
 
 Use `-d` option to enable debug message.
 
-## Encryption table cache ##
 
-If the server has many different passwords, startup would be slow because it takes much time to calculate encryption tables. It's recommended to enable the `cache_enctable` option if you have more than 20 different passwords. This will save the computed encryption table in the file `table.cache`.
+## Use multiple servers on client
+
+```
+server_password    specify multiple server and password, server should be in the form of host:port
+```
+
+Here's a sample configuration [`client-multi-server.json`](https://github.com/shadowsocks/shadowsocks-go/blob/master/sample-config/client-multi-server.json). Given `server_password`, client program will ignore `server_port`, `server` and `password` options.
+
+Servers are chosen in round robin fasion. If a server can't be connected, the client will try the next one. The client does not try to detect connection problems caused by incorrect password, this is intended for the user to notice the error.
+
+## Multiple users with different passwords on server
+
+The server can support users with different passwords. Each user will be served by a unique port. Use the following options on the server for such setup:
+
+```
+port_password   specify multiple ports and passwords to support multiple users
+cache_enctable  store computed encryption table on disk to speedup server startup
+```
+
+Here's a sample configuration [`server-multi-port.json`](https://github.com/shadowsocks/shadowsocks-go/blob/master/sample-config/server-multi-port.json). Given `port_password`, server program will ignore `server_port` and `password` options.
 
-Note: unused password will not be deleted, so you may need to delete the table cache file if it grows too big.
+Enabling `cache_enctable` is recommended if you have more than 20 different passwords. Unused password will not be deleted, so you may need to delete the file `table.cache` if it grows too big.
 
-## Updating port password for a running server  ##
+### Update port password for a running server  ###
 
 Edit the config file used to start the server, then send `SIGHUP` to the server process.