  For the first time an example of hyperchaos synchronization with a zero
driving variable using the system's parameters changes, proposed by L.Zonghua
and C.Shigang (Phys.Rev.E, 55, 6651 (1997)) is presented. Also it has been
indicated that in the case of a single variable driving put forward by
A.Tamasevicius and A.Cenys, Phys.Rev.E, 55, 297 (1997) such an approach allows
one to avoid the threshold effect on the value of the parameter responsible for
the "weight" (intensity) of nonreplica approach to the chaos synchronization
proposed by M.Ding and E.Ott, Phys.Rev.E,49, R945 (1994).
