A method, an apparatus and a computer program, the method including detecting first information, indicating that a first action is to be performed, from an optical user input device, the first information being provided by the optical user input device in response to gesture input from a user; detecting further information from an input device; and using the further information to disambiguate, subsequent to detection of the first information, second information provided by the optical user input device to determine whether the second information indicates termination of the gesture input or continuation of the gesture input.