Orgasms

My current boyfriend (of about 3 months so far) commented on how he wants to make me orgasm when we have sex. I know exactly what he needs to do to get me there because it always worked with my ex boyfriend. I am afraid if I tell him specifically how he can get me there it's going to create this pressure situation for him and me. I don't want him to feel like he can't do something that someone else has done for me if it doesn't happen. I don't know what to do. Do I tell him? Do I not tell him?