An information display system for a vehicle includes an interior rearview mirror assembly disposed in an interior cabin of a vehicle and a video display screen disposed at the interior rearview mirror assembly. The video display screen is operable to display information including video images captured by a rearward facing camera of the vehicle for assisting the driver during a reversing maneuver, and the video display screen is further operable to display information including at least one instruction pertaining to an accessory of the vehicle. The display of the instruction includes at least one of (a) text pertaining to the accessory, (b) an icon pertaining to the accessory and (c) an image pertaining to the accessory.