We vacate the trial court’s retention of jurisdiction and remand with instructions that the court either enter an order stating with particularity the justification for retaining jurisdiction as required by section *975947.16(3)(a), Florida Statutes (Supp. 1982) or relinquish jurisdiction over the first half of the sentence. Mobley v. State, 409 So.2d 1031 (Fla. 1982); Saname v. State, 448 So.2d 14 (Fla. 1st DCA 1984); Abbott v. State, 421 So.2d 24 (Fla. 1st DCA 1982); Hampton v. State, 419 So.2d 354 (Fla. 4th DCA 1982).

Retention of jurisdiction vacated; remanded with instructions.