It's been around for a while, I just got prompted to add it to /lists recently: https://news.ycombinator.com/item?id=37579724.

All: if you see a particularly great comment, let us know at [email protected] and we'll take a look and hopefully add it. We don't want to be the only ones noticing these!

At some point, /meta may be useful to record comments and threads which lead to HN improvements. A parallel universe to https://github.com/minimaxir/hacker-news-undocumented.