Arm (14) for driving a blade (12) of a wiper (10) of a vehicle, particularly a motor vehicle, comprising an end piece (28) for fixing to the wiper blade, the arm further comprising a spray nozzle (40) for spraying a fluid, such as a washer fluid, characterized in that the spray nozzle is mounted to pivot about a pivot pin which is directly fixed or attached to the said end piece, and in that the said spray nozzle comprises means configured to collaborate with the said blade to cause the spray nozzle to pivot about the said pin.