Abstract: We review a work of V. Geyler on the spectrum of a two-dimensional magnetic Schroedinger operator with a periodic system of point interactions (see Algebra i analiz 3 (1991), No. 3; English translation entitled The two-dimensional Schroedinger operator with a uniform magnetic field, and its perturbation by periodic zero-range potentials appeared in St. Petersburg Math. J. 3 (1992), 489-532).