Update README.md

hanachin · Jun 5, 2014 · f429336 · f429336
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@@ -23,8 +23,11 @@ gem 'ruboty-idobata'
 ```
 
 ## Screenshot
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 ![](https://raw.githubusercontent.com/hanachin/ruboty-idobata/master/images/screenshot.png)
 
+Notice: _The default robot name is `ruboty`, so if you want to use another name(e.x. `ellen`), you must be set `ROBOT_NAME` environment variable._
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 ## Contributing
 
 1. Fork it ( http://github.com/hanachin/ruboty-idobata/fork )