N.H. Rev. Stat. Ann. § 356-B:9

After the creation of the condominium, no description of a condominium unit shall be deemed vague, uncertain, or otherwise insufficient or infirm which sets forth the identifying number of that unit, the name of the condominium, the name of the town or city and county wherein the condominium is situated, and the deed book and page number where the first page of the declaration is recorded. Any such description shall be deemed to include the undivided interest in the common area appertaining to such unit even if such interest is not defined or referred to therein.