805 ILCS 405/3a
Any person who has executed and filed the certificate required by Section 1 or 2 of this Act and who wishes to withdraw his name from the business organization shall have the certificate cancelled in whole or in part by filing in the office of the County Clerk where the certificate is filed, a supplementary certificate under oath, showing that such person or persons have ceased doing business under the assumed name, or that the person or persons executing the supplementary certificate have no further connection with or financial interest in the business carried on under such assumed name; whereupon the County Clerk shall note opposite the trade name theretofore registered, the word "cancelled" and the date of cancellation, or, in the case of withdrawal only of one or more but less than all of the registrants, the clerk shall note the word "Withdrawn" after the name of each party filing the supplementary certificate indicating the withdrawal, together with the date of such withdrawal. When such withdrawal effectuates any change in or transfer of the ownership of 25% or more of the total ownership interest in any such business organization doing business under an assumed name, then notice of the filing of such certificate shall be published.
For filing a certificate noting the cancellation or withdrawal of one or more names, the County Clerk shall receive a fee of $1.50.
Where a person files a certificate pursuant to Section 1 or 2 setting out a change of his name, or that his name is an addition to an organization doing business under an assumed name which has previously been registered, the County Clerk shall note on the index of such person's name the word "changed" or "addition" as the case may be.
805 ILCS 405/3a