A valve-train assembly of an internal combustion engine is provided with a camshaft (1) that includes a carrier shaft (2), as well as a cam element (3) that can move on the carrier shaft between two axial positions and that has at least one cam group of directly adjacent cams (5, 6) with different cam lobes and an axial connecting link (8) constructed with a groove with outer guide walls (12, 13, 14, 15) for defining two intersecting connecting link pathways (9, 10), and with an activation pin (11) that can couple in the axial connecting link for moving the cam element in the direction of both connecting link pathways. In this way, the groove base of one connecting link pathway and the groove base of the other connecting link pathway should extend radially offset in height relative to each other, so that the connecting link pathway (9) with the radially lower groove base is also defined by inner guide walls (19, 20) that are formed by the offset in height.