The aim of this comment is to show that some results of Reference 1 are in fact equivalent to the well-known results of earlier papers.2 First, it will be shown that the discrete equations of the so-called single term Walsh series (STWS) approach are the same as those obtained, for example, by Rao and Srinivasan' via matrix manipulations.Secondly, we would like to point out that it is not necessary to use an algorithm for extension of computation beyond the initial normal interval to obtain the STWS approach. This can be done easier by applying the well-known trapezoidal rule of integration (sometimes called a Tustin integrating operator4).Let us start with the first remark. The STWS approach requires the following equations'