Storage sheds -- Addendum necessary to prevent liability?

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I have a rental home with 4 storage sheds out back. I would like to keep a couple of these but am concerned about any liability issues that could arise. If I were to include an addendum to the lease which states I am not liable for any issues pertaining to the storage sheds (whether they be to the sheds themselves or to the tenants from any injury), would that protect me?