• Generally, a party must obtain the court’s permission to file a supplemental complaint. Fed. R. Civ. P. 15(d). Cf. amended complaint. [Cases: Federal Civil Procedure 864; Pleading 279. C.J.S. Pleading §§ 461, 463–464, 466.]
supplemental complaint
An additional complaint that either corrects a defect in the original complaint or adds relevant matters that occurred after the action began.