Yes, note this is new for amended returns

 To file an amended Wisconsin return, put a check mark in
the space next to item A1 on the front of the return, complete
the return, and include Schedule AR to provide an explanation of any changes made. Show computations in detail, including any applicable supplemental forms or schedules.
Also show how you figured your refund or additional
amount owed. Do not attach a copy of the original return.

here is a link for complete instructions: https://www.revenue.wi.gov/TaxForms2017through2019/2018-Form5S-Inst.pdf