Add a comma after the designation

Warning²Federal courts, Illinois courts21st edition only

An editor's or translator's designation is closed by a comma before the publisher, edition or date that follows it.¹

1. 1R. 15.2(a) Basic format. Tables: R. 15.4 Edition, Publisher, and Date.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.