770 ILCS 105/3
Before enforcing a lien as provided for in subsection (A) of Section 1 of this Act, an initial notice in writing shall be given to the customer, either delivered personally or sent by registered mail to the last known address of the customer. This notice shall state that a lien is claimed in the amount therein set forth or thereto attached for processing work contracted or performed for the customer. This notice shall also include a demand for payment.
Before enforcing a lien as provided in subsection (B) of Section 1 of this Act, an initial notice in writing shall be given to the customer and processor, either delivered personally or sent by registered mail to the last known address of the customer and the processor. The notice shall state that a lien is claimed in the amount set forth in or attached to the notice for the fabrication, repair, or modification of the special tool. The notice shall also include a demand for payment.
770 ILCS 105/3