README.md in carte-server-0.0.20 vs README.md in carte-server-0.0.21

- old
+ new
@@ -26,15 +26,25 @@
 | [carte-server](https://rubygems.org/gems/carte-server)     | provides JSON API (document is [here](https://github.com/tily/carte/wiki/API))  |
 | [carte-client](https://www.npmjs.com/package/carte-client) | builds client side javascript         |
  
 ## Deploy
 
+**Heroku**
+
 [![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/tily/carte-sandbox)
 
 Deploy your carte with the button above. After deployment, you may want to customize your carte.
 
 ```
 ## change title and description
 $ vi config.json
 ## replace brand icon
 $ cp ~/Desktop/icon.png public/images/icon.png 
+```
+
+**Docker**
+
+```bash
+$ docker build -t carte .
+$ docker run --name mongo -d mongo
+$ docker run --name carte --link mongo:mongo -p 80:80 -d carte
 ```