%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-6-5 on page I-241 in "Customizing todos".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}

  \setlength\marginparwidth{70pt}
  \addtolength\textwidth{-\marginparwidth} % make room on the page
  \addtolength\textwidth{-2\marginparsep}  % in the book example

  % smaller heading for the example
  \makeatletter
  \renewcommand\section{\@startsection{section}{1}{\z@}%
    {-1.25ex \@plus-1ex \@minus-.2ex}%
    {.5ex}%
    {\normalfont\large\bfseries}}
  \makeatother

  \usepackage{microtype} % improve h&j in example

%StartShownPreambleCommands
\usepackage[loadshadowlibrary]{todonotes}
\setuptodonotes{shadow,size=scriptsize}
%StopShownPreambleCommands

\begin{document}
\todo{A normal entry}
\todo[caption=Alert,prepend]{Correct this}
\todo[nolist]{Hide it}
\todo[author=Frank]{An authored todo}
\todo[caption=Cases]{Covered all cases?}

We use a wide margin here to save space
in the example. The todos are summarized
in the list below (omitting the one
labeled \texttt{nolist}).

\listoftodos[Sample todos]
\end{document}