How to Add Description to TOC

Question

I would like to add an explanation to each chapter... like the picture...

Is there a way to edit the TOC in this way??

I need to have a similar result to the one shown in the picture above.

Answer 1

I assume that the descriptions should not be used with page numbers as well, so I provide a macro named \desctotoc which writes the argument to the ToC and leaves some medium vertical space afterwards.

In order to prevent fragile commands causing errors, I used a \detokenize - approach within \addtocontents which is the 'master' macro for writing contents to a ToC - related file.

\documentclass{memoir}

\usepackage{blindtext}

\newcommand{\desctotoc}[1]{%
  \addtocontents{toc}{\medskip\noindent\detokenize{#1}\leavevmode\par\medskip}
}

\begin{document}
\tableofcontents

\chapter{Foo}
\desctotoc{%
  \begin{itemize}
    \item foo
    \item bar
  \end{itemize}
}

\chapter{Foobar}

\desctotoc{\blindtext}


\end{document}