  In our publication from 8 years ago (Phys. Rev. B {\bf 84}, 115119 (2011)) we
calculated RKKY interaction between two magnetic impurities adsorbed on
graphene at zero temperature. We show in this short paper that the approach
based on Matsubara formalism and perturbation theory for the thermodynamic
potential in the imaginary time and coordinate representation which was used
then, can be easily generalized, and calculate RKKY interaction between the
magnetic impurities at finite temperature.
