  There is presented a phenomenological description of phase diagram of
ferromagnet superconductor URhGe. In frame of the Landau phenomenological
theory it was found that phase transition between anisotropic ferromagnetic and
paramagnetic states under strong enough magnetic field perpendicular to
direction of easy magnetization changes from the second to the first order
type. It is shown that magnetic susceptibility corresponding to longitudinal
magnetic fluctuations strongly increases in vicinity of the first order
transition stimulating reentrance of superconducting state.
  The reentrant superconductivity observed near the first order transition line
at temperatures about twice lower than the tricritical point temperature exists
both in ferromagnet and paramagnet state. The critical temperature of
transition to superconducting state falls down at intersection with line of
ferromagnet-paramagnet phase transition.
