# Options

## banner

Type: `String`
Default: `null`

Prefix the compressed source with the given banner, with a linebreak inbetween.

## keepSpecialComments

Type: `String` `Number`
Default: `'*'`

To keep or remove special comments, exposing the underlying option from [clean-css](https://github.com/GoalSmashers/clean-css).. `'*'` for keeping all (default), `1` for keeping first one, `0` for removing all.