Addendum to Fundamental questions relating to ion conduction in disordered solids

The extensive review cited in the title discusses a number of basic scientific questions relating to ion conduction in homogeneously disordered solids [J. C. Dyre , Rep. Prog. Phys. 72, 046501 (2009)]. Although it suggests answers to some of the questions raised, its main purpose is to draw attention to the fact that this field of research still presents several fundamental challenges. This work succeeds admirably in that goal, but it does not contain reference to and discussion of some relevant published work related to the fundamental questions it discusses. It is therefore the purpose of this work to add additional information about some of these subjects, including new insights about the Barton, Nakajima, and Namikawa relation. Although most of this information is based on published papers, its omission from the cited review is an indication that it is not widely known and is therefore worth discussing.