In a recent work [R. Shojaei et al., Phys. Rev. E 100, 022303 (2019)2470-004510.1103/PhysRevE.100.022303] the authors calculate numerically the critical temperature T_{c} of the balanced-imbalanced phase transition in a fully connected graph. According to their findings, T_{c} decreases with the number of nodes N. Here we calculate the same critical temperature using the heat-bath algorithm. We show that T_{c} increases with N as N^{γ}, with γ close to 0.5 or 1.0. This value depends on the initial fraction of positive bonds.