  We point out that argumentation presented in [Phys. Lett. A 417, 127699
(2021)], leading to the conclusion that in periodic systems there is a
superselection principle forbidding two different Bloch states to form a
coherent superposition of a fixed phase, is unjustified and false. As an
example, we show that the operator projecting to the selected Wannier state can
be experimentally utilized to determine relative phase between superposed Bloch
states. In this way we argue that, in fact, the non-existence of the
aforementioned superselection principle is manifested always when localized
measurements are performed, for example in state-of-the-art experiments with
ultracold atoms confined in optical lattices.
