[OS X TeX] footnotes in tabular

[Google Kreme]

\documentclass{article}
\begin{document}
\begin{center}
\begin{tabular}{l|r}
\hline Key & Action \\
\hline Mouse 1 & Fire\footnote{Don't forget you need to reload your
ammo} \\  \hline
\end{tabular} \\[10pt]
\end{center}
\end{document}

the footnote mark appears, but thefootnote does not.

I tried adding a "\usepackage{tabularx}" and changing the begin/end to
tabularx, but then I got

! Missing number, treated as zero.
@ \begin{tabularx}{l|r}

-- 
 ::::::===   <http://2blog.kreme.com>  ===::::::
 :: Build a man a fire and he'll be warm for  :: 
 :: a night, but set a man on fire and he'll  ::
 :: be warm for the rest of his life.         ::
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