Description for text

Question

How do I do add superscript[1] and add description at the end of the page? Is there any easy way?

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[1] Adding description below the page and using numbers as superscripts

Answer 1

What you need is a \footnote.

Answer 2

If bonzi wants the footnote marker to be enclosed inside square brackets (which is unusual), then a redefinition of \@makefnmark will be necessary

\documentclass{article}

\makeatletter
  \renewcommand\@makefnmark{\hbox{\@textsuperscript{\normalfont[\@thefnmark]}}}
\makeatother

\begin{document}

Some text\footnote{Some test footnote}

\end{document}