README.md in ponytail-0.3.0 vs README.md in ponytail-0.4.0

@@ -40,9 +40,15 @@
 $ rake db:migrate:reset
 $ cd spec/dummy
 $ rails s
 ```
 
+## Example site
+
+Dummy app is deploying on heroku. However, you can not change the migration files and databases.
+
+http://ponytail.herokuapp.com/rails/migrations
+
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)