  Radiative corrections to the $h\rightarrow Z\gamma$ are evaluated in the
one-loop approximation. The unitary gauge gauge is used. The analytic result is
expressed in terms of the Passarino-Veltman functions. The calculations are
applicable for the Standard Model as well for a wide class of its gauge
extensions. In particular, the decay width of a charged Higgs boson $H^\pm
\rightarrow W^\pm\gamma$ can be derived. The consistence of our formulas and
several specific earlier results is shown.
