Abstract: A valve actuation system for an internal combustion engine The valve actuation system (S) for an internal combustion engine comprises: ·a rocker (6) pivotably mounted around a pivot axis (A6), comprising: ·a driven end portion (62) for cooperating with a rotating cam including a main bump and at least one smaller auxiliary bump; ·an actuating end portion (63) including a piston (8) for opening at least one valve of the engine following the cooperation of the driven end portion (62) with a bump of the cam, the piston (8) being slidably mounted relative to the rocker (6) between a extended position allowing said piston (8) to open said valve when the driven end portion (62) contacts the auxiliary bump, and a retracted position preventing said piston (8) to open said valve when the driven end portion (62) contacts the auxiliary bump; ·a fluid circuit for causing the piston (8) to move from its retracted position to its extended position; ·a reset circuit comprising a reset valve (99) rotatably mounted relative t