As a home seller, you do not have to disclose what you do not know. How can you? You can not be responsible for something you were not ever aware of. On the other hand, you can be held responsible for things you do know except...
Except that even if you did not disclose a particular fact or defect or condition, if the buyer discovers the thing in question on their own, by an inspector or by some other means, then the seller's failure to disclose is "intervened" by the subsequent discovery of information.
Also, if the buyer is put on notice that the seller has made major repairs, remodeling, or spent tens of thousands of dollars on renovations, then the buyer is then in a position to inquire further if interested. While the failure to inquire may not be a complete legal defense, it is certainly a factual one.
As a seller, never allow your realtor to advise you to leave something off of a Sellers' Disclosure Notice unless he/she also gives you that advice in writing.