Jim Harbaugh just made the biggest offseason splash of his three years in Ann Arbor.

Monday afternoon, ex-Ole Miss quarterback Shea Patterson announced that he will transferring to Michigan to finish his collegiate career. He made the announcement via Twitter.

Patterson comes to Michigan after spending the last two seasons at Ole Miss. He was the primary starter for the Rebels last fall but missed the final five games due to injury. In seven games, Patterson threw for 2,259 yards and 17 touchdowns with nine interceptions. He also had a 63.8 completion percentage.

This fills a huge void for the Wolverines, as the passing attack was one of the worst nationally last season. Michigan’s 168.6 yards per game average ranked 112th nationally and the nine touchdown passes were fifth-fewest in college football.

Michigan lost former starting quarterback Wilton Speight to transfer and John O’Korn’s eligibility has expired. Freshman quarterback Brandon Peters is the only returner at the position with any experience, starting in three games.

For Harbaugh and the Wolverines, Patterson might be the most important addition to the roster this signing period.