A surgical robotic system for augmenting a representation of a surgical site at which a surgical procedure can be carried out, the system comprising: a display configured to display part or all of a representation of at least a portion of a surgical site; a controller comprising an input device, whereby the input device can control an indicator on the display, the controller being configured to output an augmentation signal in response to user input relating to the representation; and a processor configured to receive the augmentation signal and, in response to the received augmentation signal, to augment the representation of the surgical site.