It's up to you. I believe that honesty is the best policy, but some don't believe they should have to disclose. If you choose to disclose, however, you don't need to do so right away. Some people choose early on in a relationship, but after a few dates. That way you get to know each other and tell them once you are certain you would like to pursue it further. I haven't it done it myself, but that's my plan. Good luck!