在目录中添加带有回忆录的子部分

Question

对于回忆录，目录中似乎只显示章节/节，但我需要在回忆录文档的目录中显示子节。我该怎么做？

\documentclass[12pt,oneside]{memoir}

\title{Document}
\author{prosseek}
% }

\begin{document}
\frontmatter
\maketitle
\tableofcontents
\mainmatter
\chapter{The Domain Problem and Stakeholders}
\section{First}
abcdef.
\subsection{Sub}
def

\end{document}

Answer 1

\documentclass[12pt,oneside]{memoir}

\title{Document}
\author{prosseek}
% }
\setsecnumdepth{subsection}        %% added
\settocdepth{subsection}           %% added
\begin{document}
\frontmatter
\maketitle
\tableofcontents
\mainmatter
\chapter{The Domain Problem and Stakeholders}
\section{First}
abcdef.
\subsection{Sub}
def

\end{document}