why does the quarterback have to call the play at the line if they’ve discussed it in the huddle

Question

So, notwithstanding an audible where he’s changing the play, what else is there to announce?

In: 1

Answer 1

Sometimes the QB will call two plays in the huddle. Then at the line the QB will make an audible to tell the line which one to do depending on how he read the defense and if he sees a weak spot for the receiver to exploit.