820 ILCS 405/1701
General and special rules may be adopted, amended, or rescinded by the Director only after public hearing or opportunity to be heard thereon, of which proper notice has been given. General rules shall become effective ten days after filing with the Secretary of State and publication in one or more newspapers of general circulation in this State. Special rules shall become effective ten days after notification to or mailing to the last known address of the individuals or concerns affected thereby. Regulations may be adopted, amended, or rescinded by the Director and shall become effective ten days after filing with the Secretary of State, and such filing shall be public notice of such regulation, amendment thereto, or rescission thereof, as the case may be.
820 ILCS 405/1701