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docs/english-documentation/customization/javascript.md

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+# Javascript
+
+If you want to add some custom Javascript code, `app/assets/javascripts/custom.js` is the file to do it. For example to create a new alert just add:
+
+```javascript
+$(function(){
+  alert('foobar');
+});
+```
+
+If you work with Coffeescript code you can check it with [coffeelint](http://www.coffeelint.org/) \(install with `npm install -g coffeelint`\) :
+
+```bash
+coffeelint .
+```
+