  We show that a physical realization of the phase diagram proposed by
Minnhagen et al. [Phys. Rev. B 78, 184432 (2008)] for so-called generalized
fully frustrated XY model on square lattice can be achieved in arrays of SFS
(superconductor-ferromagnet-superconductor) junctions near the transition of
the junctions to $\pi$-state. Moreover, the phase diagram with such a topology
has to be reproduced twice, on both sides of the $0-\pi$ transition.
