After searching on Google and reading examples of subjunctives on the link above, I'm still not sure if I should use subjunctive in this manner.
Context: I asked a question about Problem A. Someone helped me and told me there's another problem with B. Then I would like to reply and thank him for telling me what I didn't notice before.
Is it appropriate to use the subjunctive or not for the situation?
Thank you. I won't notice the problem B if you don't mention that.
Thank you. I wouldn't have noticed the problem B if you hadn't mentioned that.