  An analytical result for renormalization of the jump of the heat capacity
Delta C/C_N by the anisotropy of the order parameter is derived in the
framework of the model proposed by Haas and Maki [Phys. Rev. B 65, 020502(R)
(2001)], for both prolate and oblate anisotropy. The graph of Delta C/C_N
versus the ratio of the gaps on the equator and the pole, Delta_e/Delta_p, of
the Fermi surface allows a direct determination of the gap anisotropy parameter
Delta_e/Delta_p using data from specific heat measurements.
