Addendum [to "Fundamentals of Electromagnetic Units and Constants"]

Since the article by K.T. Selvan, "Fundamentals of Electromagnetic Units and Constants" (IEEE Antennas and Propagation Magazine, Vol 54, no 3, June 2012, pp. 100-114) appeared in print, two relevant previous papers have come to the author\´s attention and are note here. Leo Young\´s article (2002) presents an interesting discussion, with examples, of conversion and comparison between different systems of electromagnetic units. The more recent article by Pelosi and Sellari (2010) provides a historical account of the measurement and naming of the velocity of light, c.