RequestHN: Ability to save favorite posts on profile

Okay, I'm not sure if "RequestHN" is a common/valid HN topic post, but I have been thinking it would be cool to see an addition to HN that allows us to save a favorite article when we read it.

I know this can already be done with browser bookmarks, wunderlist, etc., but there's something about having it tucked in the app that I think would be really helpful. Especially useful for those articles that you don't have time to read now, but want to save for later and come back to in the future.

Thoughts?