Wis. Stat. § 704.15: Requirement that landlord notify tenant of automatic renewal clause.

A provision in a lease of residential property that the lease shall be automatically renewed or extended for a specified period unless the tenant or either party gives notice to the contrary prior to the end of the lease is not enforceable against the tenant unless the lessor, at least 15 days but not more than 30 days prior to the time specified for the giving of such notice to the lessor, gives to the tenant written notice in the same manner as specified in s. 704.21 calling the attention of the tenant to the existence of the provision in the lease for automatic renewal or extension.