Vacuum Line Confusion

[E_Rock]

So I am almost done with my z32 rebuild and everything is going great. Im using this diagram to help me re-run my vacuum lines from my wastegate and such. What im confused on is the vacuum line that is "to throttle body". Where exactly is that line going? thanks in advance.
http://i423.photobucket.com/albums/pp317/jcfishel/cars%20misc/tt_vacuum_diagram.jpg

[jesse_s13]

Edit: Idk It connects to the wastegate actuator