Tenant Voluntarily Leaves Property

[Gardy Saturne]

I'm in the process of evicting one of my tenants in cleveland. They are behind 7 months in rent. They voluntarily agreed to move out this friday. We plan to meet at the property, walk through the unit and have them turn over they keys. This lease that is in place is Month-2-Month. Assuming things go as planned: they still move out voluntarily, don't leave any personal belongings behind, and there's no major damage to the unit ... I shouldn't have anything to worry about.

So I'm thinking about just creating an addenum saying they are moving out, forfeiting deposit, etc .. is there anything else I should be worried about it ? If I don't lawfully evict a tenant in ohio .. is it possible for them to come back and try to sue the landlord ?