Just found the place where it's mentioned, which I'm sure you've read before ;)

https://news.ycombinator.com/newsguidelines.html

Don't solicit upvotes, comments, or submissions. Users should do those things when they run across something they personally find interesting, not because someone has content to promote.

Going forward, it would be smart of you to assume that any community that uses voting, it's usually against the etiquette to solicit for votes. Especially if you haven't read the guidelines :)