75 ILCS 60/2
Such acting trustees may make, sign and acknowledge before any officer authorized to take acknowledgments of deeds in this state, and file in the office of the Secretary of State a statement in writing, in which shall be set forth the intent of such trustees to form a corporation under this act; a copy of the will or other instrument by which endowment of said library has been provided; the name adopted for the proposed corporation (which shall not be the name of any other corporation already existing); the city, village or town in which the library and the principal place of business of the corporation will be located; the number of managers who may be denominated trustees, managers or directors of the corporation; and the names of the trustees, managers or directors who are to constitute the original board of such officers, and who shall hold until their successors respectively are elected and qualified, as in this act provided.
75 ILCS 60/2