Lease expiration vis-a-vis notices

[Mohan Deep]

I am in Milwaukee, WI and I use the WLB lease format to sign fixed-term yearly leases with my tenants. Additionally, I have a "Notice to Vacate" section in my non-standard rental provisions indicating that tenant and landlord must provide a 2 full calendar month notice to vacate. 

At the end of the lease, do I have to provide a "notice to vacate" or does the lease expire automatically since it is a fixed-term lease?