O.C.G.A. § 15-2-10: Procedure for increasing the number of Supreme Court Justices.

The additional justiceships created in 2016 shall be appointed by the Governor for a term beginning January 1, 2017, and continuing through December 31, 2018, and until their successors are elected and qualified. Their successors shall be elected in the manner provided by law for the election of Supreme Court Justices at the nonpartisan judicial election in 2018, for a term of six years beginning on January 1, 2019, and until their successors are elected and qualified. Future successors shall be elected at the nonpartisan judicial election each sixth year after such election for terms of six years and until their successors are elected and qualified. They shall take office on the first day of January following the date of the election.