[OS X TeX] Named theorem

[Alain Schremmer]

I want

    Theorem 1.  a theorem
    Theorem 2 (Schremmer). This is it theorem
    Theorem 3.  another theorem

 From page 139, Companion 2ed,

    \usepackage{amsthm}
    \theoremstyle{definition}
    \newtheorem{thm}{Theorem}

    \begin{thm}
    a theorem
    \end{thm}

    \begin{thm}[Schremmer]
    This is it theorem
    \end{thm}

    \begin{thm}
    another theorem
    \end{thm}

should do it but when I try, (Schremmer) is not boldfaced like Theorem 2 
as it is in the Companion.


Regards
--schremmer
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