  We analyzed the entropy production in the majority-vote model by using a
mean-field approximation and Monte Carlo simulations. The dynamical rules of
the model do not obey detailed balance so that entropy is continuously being
produced. This nonequilibrium stochastic model is known to have a critical
behavior belonging to the universality class of the equilibrium Ising model. We
show that the entropy production also exhibits a singularity at the critical
point similar to the one occurring in the entropy, or the energy, of the
equilibrium Ising model.
