Arthur and Matilda O'Hara

Looking for marriage info on the following if anyone can help.
I have this taken from 1911 census:
1911 living Larne street Ballymena. Arthur O'hara, wife Matilda from Co Derry, son Eneas (born 1909 my grandfather) and also showing a daughter Jane 2 months old. ( this is a surprise) but I am sure I have the correct family as all dates and names add up to my research. Any help appreciated. Matilda's maiden name was McNamee as stated on my grandfathers birth cert.
thank you :-)