If I vote to close, one of the options presented to me is that the question belongs on a different SE site. I don't recall seeing this option before so I assume this is a relatively new feature, which I think is a good one. However, only three options are listed (meta.MO, math.SE, and stats.SE). But I can think of at least three other sites that arise frequently (hsm.SE, cs.SE and cstheory.SE) and there are probably others (physics.SE?). Why is the list so short? Can it be lengthened?