65 ILCS 5/11-141-17
If the corporate authorities adopt a resolution to proceed with the construction or acquisition of the project as provided in Section 11-141-16, they shall adopt an ordinance providing for the issuance of the bonds. The ordinance shall contain the necessary detail and data provided for by Section 11-141-3. It shall not be necessary that the ordinance refer to plans and specifications nor that there be on file for public inspection prior to the adoption of such ordinance detailed plans and specifications of the project. Within 10 days after the ordinance has been passed, it shall be published at least once in one or more newspapers published in the municipality, or, if no newspaper is published therein, then in one or more newspapers with a general circulation within the municipality. In municipalities with less than 500 population in which no newspaper is published, publication may instead be made by posting a notice in 3 prominent places within the municipality. The ordinance shall become effective 10 days after the publication.
65 ILCS 5/11-141-17