The invention relates to a cap A comprising a first portion 1 that is able to cover a first end of a wiper arm of a wiping system of a vehicle, and a second portion 2 comprising an attachment means for attaching the cap A to the driving arm, characterized in that this attachment means comprises at least one rotation zone 222 that is arranged so as to allow the cap A to rotate with respect to the driving arm, and a zone 223 for locking said cap A to said driving arm.