Many recent discussions of truth and its (in)definability can serve to illustrate a well-known fallacy. This fallacy is the fallacy of authority. The authority in question is Alfred Tarski. He is of course a genuine authority when it comes to the definability of truth (see Tarski, [1935] 1983). But then, the fallacy of authority does not mean an authority's mistake, but a misinterpretation of what the authority is supposed to have said.