(750 ILCS 22/211)
Sec. 211. Continuing, exclusive jurisdiction to modify spousal-support order. (a) A tribunal of this State issuing a spousal-support order consistent with the law of this State has continuing, exclusive jurisdiction to modify the spousal-support order throughout the existence of the support obligation.
(b) A tribunal of this State may not modify a spousal-support order issued by a tribunal of another state or a foreign country having continuing, exclusive jurisdiction over that order under the law of that state or foreign country.
(c) A tribunal of this State that has continuing, exclusive jurisdiction over a spousal-support order may serve as:
(1) an initiating tribunal to request a tribunal of another state to enforce the spousal-support order issued in this State; or (2) a responding tribunal to enforce or modify its own spousal-support order. (Source: P.A. 99-119, eff. 1-1-16.)