I found nothing that indicates that it is a requirement but since I am unfamiliar with the extensive Illinois law on foreclosure; I recommend you reading this http://law.justia.com/illinois/codes/2005/chapter5... Foreclosure Statutes. Section 15-1503, 15-1504. These are lengthy.
The complaint forms are not lengthy, (you can find these online when you search for the form) they are simple yet specific and again I did not see anything that indicates the specific foreclosure statute should be indentified in the complaint to foreclose. Of course I am not an attorney and do not know all of the laws in Illinois and in my search I could not locate anything that said it did.
I hope this helps.