O.C.G.A. § 33-24-38: Renewal or extension of policies by certificate or endorsement.

Any insurance policy terminating by its terms at a specified expiration date and not otherwise renewable may be renewed or extended at the option of the insurer and upon a currently authorized policy form and at the premium rate then required for renewal or extension for a specific additional period or periods by certificate or by endorsement of the policy and without requiring the issuance of a new policy.