I've looked around for a good explanation, and most of what's out there seems pretty poor. You could probably write something like:

```
// An `NSArray` of `NSStrings`s to limit the diff to specific paths inside
// the repository.  The entries in the array represent either single paths
// or filename patterns with wildcard matching a la standard shell glob
// (see http://linux.die.net/man/7/glob for wildcard matching rules)
```