  We propose an identification of the free parameter in the model of nonlinear
electrodynamics proposed in P. Gaete and J. Helayel-Neto, Eur. Phys. J. C 74,
2816 (2014) by equating the second term in the power expansion of its
Lagrangian with that in the expansion of the Heiseberg-Euler Lagrangian. The
resulting value of the field-energy of a point-like charge makes 0.988 of the
electron mass, if the charge is that of the electron.
