  This paper contains a criticism of the article: Ch. Simon, V. Buzek and N.
Gisin: ``No-Signaling Condition and Quantum Dynamics'', Phys. Rev. Lett. 87
(2001) 170405, containing a proposal of adoption into quantum mechanics (QM) a
new basic axiom. This axiom was declared to imply linearity of time evolution
in QM on the basis of kinematic assumptions only. It is shown why, under the
considered conditions, the axiom called ``no-signaling condition'' is not
effective.
