If before trial, but subsequent to compliance with these rules, or an order entered pursuant thereto, a party discovers additional material or information comprehended by a previous request to disclose, he shall promptly notify opposing counsel or the other party of the existence of such material or information. If additional material or information is discovered during trial, the party shall notify the court and opposing counsel of the existence of the material or information.
Ark. R. Crim. P. 19.2