We granted appellant's application to appeal to determine the modification statute which applies to a petition for modification of a 1987 judgment for child support.

This case is controlled by our decision in Byrd v. Ault, 260 Ga. 893 (401 SE2d 690) (1991), which requires the application of OCGA 19-6-19 (a) as amended in 1986. The judgment of the trial court is therefore reversed.