Ill. Admin. Code tit. 92, § 554.208
Supplemental permits may be issued by the Permit Office to extend, revise, or correct permits that are still valid. Documents authorizing corrections, extensions, and revisions must accompany the original permit and be presented upon request to any police officer or authorized employee of the Department.
(Source: Amended at 11 Ill. Reg. 3248, effective February 3, 1987)