Oklahoma has added a prep wide receiver from California to its football recruiting class. The Sooners on Thursday announced the signing of Kenny Stills of Encinitas, Calif., who played for La Costa Canyon High School. The university had been waiting for clearance from the NCAA relative to Stills' eligibility before announcing his signing. Oklahoma received that clearance Thursday. Oklahoma coach Bob Stoops says he's pleased that everything is in place for Stills to join the Sooners. Stills is considered one of the nation's best prep receivers. The addition of the 6-foot-1, 175-pound Stills gives Oklahoma 29 players in its 2010 recruiting class.