Ohio Rules of Civil Procedure - Supreme Court

(D) Amendments where name of party unknown. When the plaintiff does not
know the name of a defendant, that defendant may be designated in a pleading or proceeding by
any name and description. When the name is discovered, the pleading or proceeding must be
amended accordingly. The plaintiff, in such case, must aver in the complaint the fact that he
could not discover the name. The summons must contain the words "name unknown," and a copy
thereof must be served personally upon the defendant.
(E) Supplemental pleadings. Upon motion of a party the court may, upon reasonable
notice and upon such terms as are just, permit him to serve a supplemental pleading setting forth
transactions or occurrences or events which have happened since the date of the pleading sought
to be supplemented. Permission may be granted even though the original pleading is defective in
its statement of a claim for relief or defense. If the court deems it advisable that the adverse party
plead to the supplemental pleading, it shall so order, specifying the time therefor.
[Effective: July 1, 1970.]