  We show that the separate properties of weak synchronization (WS) and strong
synchronization (SS), reported recently by Pyragas [K. Pyragas, Phys. Rev. E,
54, R4508 (1996)], in unidirectionally coupled chaotic systems, are not
generally distinct properties of such systems. In particular, we find
analytically for the tent map and numerically for some parameters of the circle
map that the transition to WS and SS coincide.
