README.md in codemirror-rails-2.3 vs README.md in codemirror-rails-2.21

@@ -33,25 +33,9 @@
 
 ```js
 //= require codemirror/modes/ruby
 ```
 
-### Adding a util
-
-Additional reusable util components can be added in your application.js:
-
-```js
-//= require codemirror/utils/dialog
-```
-
-### Adding a keymap
-
-Additional keymap bindings can be added to your application.js:
-
-```js
-//= require codemirror/keymaps/vim
-```
-
 ### Adding a theme
 
 Additional CSS themes can be added to your application.css
 
 ```js