Make sure you address this with your Realtor and double check with your attorney that you do not cause a liability issue by stating this on a public website, I am not an attorney, but I would suggest checking with one.
Yes this is something you should and are required to disclose. I good rule to go buy is ask yourself would you want it disclosed to you if you were buying the house. You may find yourself disclosing more that legally required however it is better to air on the side of caution. Besides it is the right thing to do and will bring you good Karma.