Abstract
This comment corrects an explanation, given in a recent and interesting paper by Masoliver, Porra, and Weiss [Phys. Rev. A 45, 2222 (1992)], to account for one of the discontinuities of the probability density of the telegrapher process in the presence of a trap. The discontinuity is due to the trapping of the random walkers that would have undergone one reversal if there were no trap, instead of ``reflections from the trapping point, i.e., from particles which reach the trap but reverse direction when they reach that point'', quoting from the authors.
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