Ill. Admin. Code tit. 92, § 14.1130 – Amendment of Documents

a) A pleading may be amended prior to the filing of a responsive pleading, or if no reply is filed, prior to the publishing either of a Notice of Hearing on the subject matter of the pleading or of the Order. Thereafter, amendments may be made only with leave of the Director or the ALJ.
b) All amendments shall be consecutively numbered, commencing with Amendment No. 1, and shall identify the document being amended.