What did Allah's Apostle (saw) do after the person asked him about the increase in the prayer?
 Narrated' `Abdullah:                     Once Allah's Apostle offered five rak`at in the Zuhr prayer, and somebody asked him whether there was some increase in the prayer. Allah's Apostle said, "What is that?" He said, "You have offered five rak`at." So Allah's Apostle performed two prostrations of Sahu after Taslim.