15 ILCS 305/10
Whenever any bill which has passed both houses of the General Assembly, and is not approved, or vetoed and returned by the Governor, or filed with his objection in the office of the Secretary of State, as required by Section 9, of Article IV, of the Constitution, it shall be the duty of the Secretary of State to authenticate the same by a certificate thereon, to the following effect, as the case may be:
"This bill having remained with the Governor 60 calendar days after it was presented to him, the General Assembly being in session, or the Governor having failed to return this bill to the General Assembly during its session, and having failed to file it in my office, with his objections, within such 60 calendar days, it has thereby become a law.
Dated .............. Signature ..............., Secretary of State".
15 ILCS 305/10