Apple CEO Tim Cook is about to take over one of the most significant parts of Apple’s business: its design team. The team currently reports to COO Jeff Williams, but once Williams begins his just-announced retirement “late in the year,” the design team “will then transition to reporting directly to Cook,” Apple says.

Jeff Williams, Apple’s chief operating officer, is stepping down from his role later this month, as announced by the company on Tuesday. Sabih Khan, who currently serves as the senior vice president of operations, has been appointed as the new COO.

Apple said Jeff Williams, the company's COO, will take on a new role overseeing the company's design team along with the Apple Watch and health initiatives.