Vaccum line routing

[Revs]

I've searched the forum and Google with no luck. Where does the vacuum line on the bottom of the carb go to? Trying to get the wife's bike running again and wasn't the one that removed the carb when it was cleaned. Her son in law took it off and cleaned it. He brought it home and isn't here to help me. Got everything else connected back and ready to fuel it up and see if it will start. Just can't find where the other end of the vacuum line goes.

Thanks everyone.