I found this, but it's clearly Unofficial

http://jacquesmattheij.com/the-unofficial-hn-faq#downvoted

That said, the author currently has karma 111515 so he likely knows something about it.

The guidelines[0] do mention "Please resist commenting about being downvoted. It never does any good, and it makes boring reading." [0]: https://news.ycombinator.com/newsguidelines.html