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.

Until now, the design team reported to Apple’s COO Jeff Williams. But with Williams set to retire later this year, Apple has confirmed that the team will report directly to Cook.

Apple has announced a major leadership change as Jeff Williams, the company’s chief operating officer (COO), prepares to leave the company later this year.