Unless a restriction is in this chapter, the articles, bylaws, noted conspicuously on the face or back of the certificate, or included in information sent to the holders of uncertificated membership interests, a restriction, even though permitted by this section, is ineffective against a person without knowledge of the restriction. A restriction under this section is deemed to be noted conspicuously and is effective if the existence of the restriction is stated on the certificate and reference is made to a separate document creating or describing the restriction.
Minn. Stat. § 308C.625