Averment that partners contracted by a name affixed to a writing is sufficient.

Miss. Code Ann. § 11-7-43
in effect
Sign in to generate a plain English summaryAsk Belisarius Agent
In actions against one or more of several partners, it shall be sufficient to declare that he or they made the contract or executed the writing sued on by the co-partnership name, or other signature affixed to such writing.

Starting a business in Mississippi? Mississippi LLC guide: costs and requirements