  A new feature in the spectrum of ultra high energy cosmic rays (UHECR) has
been announced in the paper by Berezinsky, Gazizov and Kachelriess. The ratio
of the solution of the exact transport equation to its solution in the
continuous energy loss limit shows intriguing features which, according to the
Authors, are related to the very nature of the energy loss processes of
UHECR:the very sharp second dip predicted at 6.3x10^19 eV can be used as an
energy calibration point and also as the UHECR mass indicator for big future
cosmic ray experiments. In the present paper we would like to advocate that
this statement is an overinterpretation. The second dip is a result of an
inapproriate approximation used, and thus it can't help to understand the
nature of UHECR in any way.
