Thanks for the advice! I will check the search first the next time. Also putting a the year if not recent.
Just to be clear, it's fine that you posted this! If checking search would have prevented you, that wouldn't be good. But you could always check search to find previous links to include for curiosity's sake (that's what I did), and to make sure that it hasn't had a significant discussion within the last year.
2017: https://news.ycombinator.com/item?id=13332741
2015: https://news.ycombinator.com/item?id=10149019
2014: https://news.ycombinator.com/item?id=7359992
(Links for the curious. Reposts are ok after a year: https://news.ycombinator.com/newsfaq.html)