Comment on: a hazard function approximation used in reliability theory

In a recent paper, Keren & Mehrez have shown that in the case of a geometric probability mass function, the approximation to the cumulative hazard function converges to a finite value (1.606695), when the actual value of the cumulative hazard function should be diverging. In this commentary, we show that gives incorrect results, and that the corresponding results for the approximation are actually diverging.