Ignore the morons clkorm3. You asked a valid question and it's a useful bit of knowledge to have.
If you don't know what the suction peak is, you won't understand the concept of centre of pressure, and if you don't understand CP you won't understand the stalling characteristics of a swept wing airliner.
If you have an iPad I strongly suggest you buy a copy of Wind Tunnel Pro. It's only about £3 and it does an absolutely amazing job of computational fluid dynamics. It's easy to see the suction peak with this app and to watch what happens to it as angle of attack increases.