Wyo. Stat. Ann. § 40-26-121

The enforcing authority may join a person not named in the complaint as an additional or substitute respondent if during the investigation the enforcing authority determines that the person is alleged to be engaged, to have engaged, or to be about to engage in the discriminatory housing practice upon which the complaint is based. In addition to the information required in the notice under W.S. 40-26-118(b), the enforcing authority shall include in a notice to a respondent joined under this section the reasons for the determination that the person is properly joined as a respondent.