Recently, Professors Hubral and Tygel presented an interesting analysis of the Rayleigh wavelet, emphasizing its twin attributes of simplicity and flexibility. My comments here are concerned mainly with the final section of their paper, where the length properties of the Rayleigh pulse are described. In particular, I demonstrate that the class of Rayleigh wavelets is characterized by a simple length formula, provided that a proper definition of waveform length is adopted. Although there are various useful definitions for signal length, width, breadth, or duration, the specific form that I employ here is commonly used by exploration seismologists. It has been examined in detail by Berkhout (1984, p. 16-28) and others.