 It was also the last SummerSlam event to occur under the WWF name, as the promotion was renamed to World Wrestling Entertainment (WWE) in May 2002.With the WWF's purchase of rival company World Championship Wrestling (WCW) back in March, some of their titles became defended on WWF programming.As such, the 2001 event was the only SummerSlam to feature the WCW Championship, as the title was unified with the WWF Championship at December's Vengeance event with the latter being renamed to Undisputed WWF Championship.