  We comment on the recent paper "Note on the perihelion/periastron advance due
to cosmological constant" by H. Arakida (Int. J. Theor. Phys. 52 (2013)
1408-1414, arXiv:1212.6289) and provide simple derivations both of the main
result of this paper and of the Adkins-McDonnell's precession formula, on which
this main result is based.
