  The effect of the interaction of mesons in the final state is additionally
considered within the description of $\tau \to \pi \eta(\eta') \nu_{\tau}$
decays. This interaction is taken into account at the level of production of
intermediate pions. One of them, in turn, might be transited into $\eta$ or
$\eta'$ mesons. Our results do not exceed the experimentally established
branching fractions, and they are in agreement with the results of other
theoretical studies.
