According to the official Revtex 4.1 documentation, if there's only one appendix, one can use \appendix* instead of \appendix to avoid having unnecessary letter A. However, in my case, adding * just prints it in the text and seem to have no effect at all. I have no idea how to debug this. What could be the problem?
UPD: commenting out \usepackage[capitalize]{cleveref} in the preamble makes \appendix* work as expected, but I need this package.
\documentclass[aps,pre,twocolumn,superscriptaddress,showkeys,showpacs]{revtex4-1}
\usepackage[capitalize]{cleveref}
\begin{document}
\title{Paper}
\date{\today}
\maketitle
\appendix*
\section{Proof of X}
Easy peasy
\end{document}
Extracted from paper.log:
revtex4-1.cls 2010/07/25/20:33:00 4.1r (http://publish.aps.org/revtex4/ for documentation)
...
revsymb4-1.sty 2010/07/25/20:33:00 4.1r (http://publish.aps.org/revtex4/ for documentation)
cleveref.sty 2013/12/28 v0.19 Intelligent cross-referencing


\appendix{*}when it should be\appendix*? – Alan Munn Sep 07 '15 at 21:05\usepackage[capitalize]{cleveref}makes\appendix*work as expected – dmytro Sep 07 '15 at 21:21