%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-5-43 on page I-233 in "Marginal notes".
%%
%% 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{159.0pt}
\sloppy
\setcounter{page}{1}
\addtolength\textwidth{-70pt}
\setlength\marginparwidth{58pt}
%StartShownPreambleCommands
 \newcommand\marginlabel[1]{\mbox{}\marginpar
    {\raggedright\hspace{0pt}#1}}
%StopShownPreambleCommands

\begin{document}
 Some\marginpar{ASuperLongFirstWord with problems}
 text with a marginal note. Some more text.
 Another text with a marginal note coming up
 next\marginlabel{ASuperLongFirstword without
   problems}. A lot of additional text here to fill
 up the space in the example on the left.
\end{document}