+
+\item[fontfamily\{<family>\}]
+{\let\item\origitem
+As in \LaTeXe, this command changes current font family (alphabetic, Japanese,~\emph{or both})
+to <family>. Which family will be changed is determined as follows:
+\begin{itemize}
+\item Let current encoding scheme for Japanese fonts be
+ <ja-enc>. Current Japanese font family will be changed to
+ <family>, if one of the following two conditions is met:
+\begin{itemize}
+\item The family <fam> under the encoding <ja-enc> is already defined by
+ \verb+\DeclareKanijFamily+.
+\item A font definition named \texttt{<enc><ja-enc>.fd} (the file name is
+ all lowercase) exists.
+\end{itemize}
+\item Let current encoding scheme for Japanese fonts be
+ <al-enc>. For alphabetic font family, the criterion as above is used.
+\item There is a case which none of the above applies, that is, the font
+ family named <family> doesn't seem to be defined neither under the
+ encoding <ja-enc>, nor under <al-enc>.
+
+In this case, the default family for font substitution is used for
+ alphabetic and Japanese fonts. Note that current encoding will not
+ be set to <family>, unlike the original implementation in \LaTeX.
+\end{itemize}
+}