For years when I wrote articles or chapters, I was frequently criticized for having these over-referenced. I was, therefore, proud that the “Orthostatic tremor…” article that was published in the Archives had no references. Unfortunately, this may have been an oversight. Perhaps I should have referenced Dr LaWitt's interesting observations on “paradoxical” clonus. Fortunately, the disorder that I described is quite different from that described by Dr LaWitt, and I believe that clinicians should have no difficulty distinguishing between orthostatic tremor and paradoxical clonus. However, it is important for clinicians to note, as suggested by Dr LaWitt's note, that while not all sustained movements while standing can be attributed to either orthostatic tremor or paradoxical clonus, it is important that the physician distinguish between the two. © 1990, American Medical Association. All rights reserved.