This is "correct", but for users who don't know it, it's still going to be an issue (admittedly less so on a tech-savvy site like GitHub). I think they could i

This is "correct", but for users who don't know it, it's still going to be an issue (admittedly less so on a tech-savvy site like GitHub). I think they could improve this by including a little text message "Open Github in a new window".