Massallah pertaining to issuing one talaaq

Slms many years ago during troubled times i issued 1 talaq to my wife -thinking that my marriage still had hopes and still had 2 more times to issue talaq before being final- the intention was more to send across a stern message -however after reading your site i now fear the worst – Alhamdolillah my marriage is intact -what do i need to do to correct my issuing the 1 talaq.