R.I. Gen. Laws § 34-16-5: Contents of complaint.

The complaint shall contain, among other things, to the extent known to plaintiff:

(1) A complete and accurate description of the real estate involved, and the right, title and interest of the plaintiff claimed therein and the character and source thereof;

(2) A recital of the character and source of claims adverse, or which may become adverse, whether asserted or unasserted, and, if unasserted, then of record;

(3) The names and last known addresses of those asserting, or who may assert, any adverse claims;

(4) The efforts made to ascertain and determine those claimants, who, or whose names and/or addresses, are unknown to plaintiff;

(5) The duration of ownership, occupation, possession, and enjoyment by the plaintiff, and when relevant, by his or her predecessors in title, of the estate involved, together with a recital of acts performed as a normal incident of the possession enjoyed and the title claimed.