>>/157/
It is parsed from the website at the moment. It is not currently user-editable. If you edit the parser, you can change what gets added, but this is fairly advanced.
If you are making a thread parser and want to see how it works, check out the existing 4chan/8chan defaults to see how I did it. There's a special content type you attach to your content parser, and that value gets sent to the downloader object for its 'name'.