Update README.md

Author: timzaak

README.md

@@ -22,7 +22,7 @@ If you want to get all requests and responses about `https://www.exmample.com (1
 
 sbt "runMain Main --dns=192.168.3.3:www.example.com --jksPath=jks.jks --jksPassword=123456 --websocketPort=9000"
 
-# run websocket client to get log
+# run websocket client to get log, ip is a filter to filter request
 websocat ws://127.0.0.1:9000/api_ws?ip=127.0.0.1
 ```
 [websocat](https://github.com/vi/websocat) is a websocket command line. and the params are: