The reasons why plerogram-type molecular graphs are almost never used in contemporary chemical graph theory are analyzed. As one more argument against the usage of plerograms, we show that the terminal-Wiener index of the plerogram of an alkane is in an (exact) linear manner related to the ordinary Wiener index, thus having the precisely same structure dependency as the ordinary Wiener index. (C) 2013 Elsevier B.V. All rights reserved.