-% |\@mainmatter| is true iff we are processing Main Matter. When this
-% switch is false, the |\chapter| command does not print chapter
-% numbers.
+% |\@mainmatter| is true if and only if we are processing main
+% matter\footnote{%
+% \href{http://en.wikipedia.org/wiki/Book_design}{Wikipedia}
+% suggests \emph{body matter} for the main content, but
+% \href{http://mirror.ctan.org/macros/latex/base/classes.dtx}{\LaTeX's
+% \cls{book}} uses \emph{Main Matter}. We're a \LaTeX\ class, so
+% we'll stick with ``main matter'' for consistency.
+% }. When this switch is false, the
+% |\chapter| command does not print chapter numbers.