  We interpret recent observations of high-to-low frequency drifting features
in the spectra of the repeating FRBs as evidence of sharply changing plasma
properties in the emission region, presumably the neutron stars magnetospheres.
The drifts are then FRBs' analogues of radius-to-frequency mapping in pulsars
and Solar type-III radio burst (but not in a sense of a particular emission
mechanism). The drifts rates of $\sim 100$ MHz ms$^{-1}$ at frequencies $\sim$
GHz translate to physical size of $\sim {c \omega}/{\dot{\omega}} \sim$ few
$\times 10^8$ cm, matching the hypothesis of the FRB origin in the
magnetospheres of neutron stars. We suggest that reconnection events result in
generation of upward propagating plasma beams that produce radio emission with
frequency related to the decreasing local magnetic field and plasma density.
