IT HAS NOT BEEN REQUIRED. BUT SOME DO GET BENT OUTTA SHAPE IF IT DOES NOT SAY IT. I HAVE RECIVED A FEW EMAILS IN MY TIME ABOUT IT I DO IT SOMETIMES BUT I HAVE BEEN HERE LONG ENOUGH NOW FOR THOSE WHO KNOW ME TO LOOK IF THEY CHOOSE AND PASS IT UP JUST AS WELL IM NOT ARGUING THE POINT JUST MY OPINION