A man who catches up with the imam in the final tashahhud of the Friday prayer, and then learns that he must complete four rak'ahs

Question : That is, a man who catches up with the imam in the final tashahhud of the Friday prayer, and then learns that he must complete four rak'ahs

Answer : We say that he completes it; he restarts the prayer. I say he restarts the prayer and repeats it as four rak'ahs, unless he is a traveler, in which case his obligatory prayer is two rak'ahs.