Add the comma before “e.g.”

Error²Federal courts, Illinois courts21st and 22nd editions

An “e.g.” attached to another signal carries a comma on each side, so the two words read as one signal rather than as two signals in a row.¹

1. 1R. 1.2(a) Signals that indicate support. Tables: B1.2 Introductory Signals.
2. 2An error: the rule in note 1 allows one form, and this is not it.