§ 909. Pleadings; amended and supplemental. (a) A party may amend his
pleading once without leave of court at any time before the period for
responding to it expires, or within ten days after its service or the
service of a pleading responding to it. An amended pleading which
requires a responsive pleading shall be responded to within ten days
after it is served, or within ten days after the expiration of the
period during which the original pleading could have been responded to,
whichever is later.

(b) Except as provided in subdivision (a), the CPLR shall govern
amended and supplemental pleadings in this court.