[zxide]

.styl is the file extension for stylus. Its just another css preprocessor like less or scss

http://learnboost.github.io/stylus/

I think this part is just a typo

> So, it has found /assets/style.styl. Now it analyzes extension:

>

> .sass extension? Use Sass then.

[svoroval]

Thank you, will fix it.