We complement the discussion of symmetries of Ito equations given in Gaeta
and Rodriguez Quintero (1999 J. Phys. A: Math. Gen. 32 8485-505) by conside
ring transformations acting on vector Wiener processes as well, together wi
th discrete symmetries. We also discuss symmetries for the random dynamical
system defined by an Ito equation, and show that there are, in general, mo
re than the symmetries of the one-particle process defined by the same Ito
equation.