The county auditor or the county judge in a county that does not have a county auditor shall certify to the commissioners court the receipt of revenue from a new source not anticipated before the adoption of the budget and not included in the budget for that fiscal year. On certification, the court may adopt a special budget for the limited purpose of spending the revenue for general purposes or for any of its intended purposes.
Tex. Loc. Gov't. Code § 111.0108