Aligning a \marginnote to a theorem title

Question

I want to create a \marginnote which is aligned to the title of a theorem. However, the \marginnote is always placed over or under the title, when I put the \marginnote command before or into the theorem environment.

\documentclass{article}

\usepackage{ntheorem}
\usepackage{marginnote}
\theoremstyle{break}
\theorembodyfont{\normalfont}
\newtheorem{definition}{Definition}

\begin{document}

\begin{definition}[my title]
    \marginnote{my comment}
    my definition
\end{definition}

\end{document}

Answer 1

Try:

\documentclass{article}

\usepackage{ntheorem}
\usepackage{marginnote}
\theoremstyle{break}
\theorembodyfont{\normalfont}
\newtheorem{definition}{Definition}

\begin{document}
\begin{definition}[my title]
    \marginnote{my comment}[-\baselineskip]% Adjust the vertical offset here
    my definition
\end{definition}

\end{document}

Note that

The command \marginnote[<left>]{<right>}[<voffset>] may be used to set a margin note using marginnote. The first optional argument and the mandatory argument are same using \marginpar from the LATEX kernel. Even \reversemarginpar will be considered. The note <left> or <right> will be put at the current vertical position. Second optional argument <voffset> may be used to adjust the vertical position of the margin note. Use a negative dimension to move it up or a positive dimension to move it down.