  It is demonstrated that the crossover between gas- and liquid-like regions on
the phase diagram of the Lennard-Jones system occurs at a fixed value of the
density divided by its value at the freezing point, $\rho/\rho_{\rm fr}\simeq
0.35$. This definition is consistent with other definitions proposed recently.
As a result a very simple practical expression for the gas-to-liquid crossover
line emerges.
