  We carry out a complete derivation on nonrelativistic energies of atomic
Rydberg states, including finite nuclear mass corrections. Several missing
terms are found and a discrepancy is confirmed in the works of Drachman [in
Long Range Casimir Forces: Theory and Recent Experiments on Atomic Systems,
edited by F. S. Levin and D. A. Micha (Plenum, New York, 1993)] and Drake [Adv.
At., Mol., Opt. Phys. 31, 1 (1993)]. As a benchmark, we present a detailed
tabulation of different energy levels.
