-Note that setting a positive value to
-\Param{yalbaselineshift}~or~\Param{talbaselineshift} does not
-increase the depth of \textbf{ALchar}, as shown below.
-This is because these parameters are implemented by setting \verb+yoffset+
-field of a glyph node, and this does not increase the depth of the glyph.
-This problem does not apply for \Param{yjabaselineshift}, since
-\Param{yjabaselineshift}~and~\Param{tjabaselineshift}
-use a different implementation method.
-%</en>
-%<*ja>
-なお,\Param{yalbaselineshift},~\Param{talbaselineshift}パラメータに
-正の値を指定しても,
-下の例のように\textbf{ALchar}の深さは増加しないことに注意.
-これは,2パラメータがglyph~nodeの\verb+yoffset+を使って
-実装されているためである.
-\Param{yjabaselineshift},~\Param{tjabaselineshift}パラメータは
-別の方法を使って実装しているので,
-このような問題は起こらない.
-%</ja>
-\begin{LTXexample}[width=.3\textwidth]
-\leavevmode\fboxsep=0pt
- \ltjsetparameter{yjabaselineshift=0pt,
- yalbaselineshift=0pt}
-\vrule width 105pt height 0.4pt depth 0pt \hskip-95pt
-\fbox{\ltjsetparameter{yalbaselineshift=10pt}あいうxyz}
-\fbox{\ltjsetparameter{yalbaselineshift=-10pt}あいうxyz}\\
-\vrule width 105pt height 0.4pt depth 0pt \hskip-95pt
-\fbox{\ltjsetparameter{yjabaselineshift=10pt}あいうxyz}
-\fbox{\ltjsetparameter{yjabaselineshift=-10pt}あいうxyz}
-\end{LTXexample}
+Note that setting positive \Param{yalbaselineshift}~or~\Param{talbaselineshift}
+parameters does not increase the depth of one-letter ``syllable'' $p$ of \textbf{Alchar}, if
+its left-protrusion~(\cs{lpcode}) and right-protrusion~(\cs{rpcode}) are both non-zero.
+This is because
+\begin{itemize}
+\item These two parameters are implemented by setting yoffset field of a
+glyph node, and this does not increase the depth of the glyph.
+\item To cope with the above situation, \LuaTeX-ja automatically supplies
+a rule in every ``syllable''.
+\item However, we cannot use this ``supplying a rule'' method if \dots
+\end{itemize}
+
+This problem does not apply for \Param{yjabaselineshift}~nor~\Param{tjabaselineshift}.
+%</en>
+%<*ja>
+なお,以下の場合には1文字の\textbf{ALchar}からなる「音節」の深さは増加しないことに注意.
+\begin{itemize}
+ \item \Param{yalbaselineshift},~\Param{talbaselineshift}パラメータが正になっている.
+ \item 「音節」を構成する唯一の文字$p$の
+左余白への突出量(\cs{lpcode}),右余白への突出量(\cs{rpcode})がどちらも非零である.
+\end{itemize}
+\Param{yjabaselineshift},~\Param{tjabaselineshift}パラメータについてはこのような問題は起こらない.
+%</ja>