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\long\def\/*#1*/{} % don't forget this line
\begin{document}
\/* This is a block-
comment over
multiple lines
in latex
*/
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\documentclass{article}
\usepackage{verbatim} %You can use long comments from this package
\begin{document}
This text will be displayed
\begin{comment}
This text will not be displayed.
\end{comment}
\end{document}
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\iffalse
One morning, as Gregor Samsa was waking up from anxious dreams, he discovered
that in his bed he had been changed into a monstrous verminous bug. He lay on
his armour-hard back and saw, as he lifted his head up a little, his brown,
arched abdomen divided up into rigid bow-like sections.
\fi
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% Your comment here
\begin{comment}
Multiple line
comment here
\end{comment}