Whenever in any fiscal year an ordinance authorizing the issuance of bonds is approved by the electors in any municipality with a population of 500,000 or more, subsequent to the passage of the annual appropriation ordinance, the corporate authorities have the power, anything in this Code to the contrary notwithstanding, to make a supplemental appropriation of so much of the proceeds of the bonds, so authorized, as is required for expenditure during the remainder of the current fiscal year for the purpose set forth in the ordinance authorizing the issuance of the bonds.
65 ILCS 5/8-1-5