Ill. Admin. Code tit. 83, § 470.240
a) The Aggregation Supplier shall verify that residential and small commercial retail customers receiving, or pending to receive, non-aggregation RES service have been sent the disclosures identified in this subsection (a), as evidenced by a written verification from the Governmental Aggregator, or by the Aggregation Supplier having sent the disclosures. The disclosures to customers receiving or pending to receive non-aggregation RES service shall contain the following information:
5) In addition, the body of the notice shall contain, in type size no smaller than the largest type size used in the body of the notice, the following statement:
"This notice is informational only. Your electric utility has informed us that you are currently served or have chosen to be served by a competitive retail electric supplier. If you want to continue to receive service from your chosen supplier, you do not need to take any additional action. Consult your contract or contact your chosen supplier for further details if you have questions about your contract, including whether you have a cancellation fee for early termination."