820 ILCS 90/35

(a) Extensive judicial reformation of a covenant not to compete or a covenant not to solicit may be against the public policy of this State and a court may refrain from wholly rewriting contracts. (b) In some circumstances, a court may, in its discretion, choose to reform or sever provisions of a covenant not to compete or a covenant not to solicit rather than hold such covenant unenforceable. Factors which may be considered when deciding whether such reformation is appropriate include the fairness of the restraints as originally written, whether the original restriction reflects a good-faith effort to protect a legitimate business interest of the employer, the extent of such reformation, and whether the parties included a clause authorizing such modifications in their agreement.