The trial court was not required to conduct an informal inquiry into the defendant's competency when a doctor testified that while the defendant's verbal ability limited him to the mentally retarded range, he was not otherwise mentally retarded. The trial court made sufficient inquiry by observing the defendant throughout the punishment hearing and by speaking with him about the punishment range, sexual offender registration requirements, and his right against self-incrimination. Schoor v. State - 07-08-0170-CR.