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By default the index starts with the first item of the indexlist. If you want a preamble like the following one:

than you have to use the komascript-docclasses or to redefine the index environment.

### Komascript classes

The komscript classes have a command for a preamble. Write anywhere in the text before you insert the \printindex:
 \setindexpreamble{% open the preamble! This is the text for the preamble ... This is the text for the preamble ... }% close the preamble!

### Other Classes

Write into the preamble:

\newcommand{\theindexpreamble}{}
\renewenvironment{theindex}
{\if@twocolumn
\@restonecolfalse
\else
\@restonecoltrue
\fi
\columnseprule \z@
\columnsep 35\p@
\twocolumn[\section*{\indexname}
%
\theindexpreamble\\
\renewcommand{\theindexpreamble}{}%
%
]%
\@mkboth{\MakeUppercase\indexname}%
{\MakeUppercase\indexname}%
\thispagestyle{plain}\parindent\z@
\parskip\z@ \@plus .3\p@\relax
\let\item\@idxitem}
{\if@restonecol\onecolumn\else\clearpage\fi}

In the text you can write anywhere
\printindex
 \renewcommand{\theindexpreamble}{% open the preamble! This is the text for the preamble ... This is the text for the preamble ... }% close the preamble!
By default the Index is in twocolumn-mode. The preamble is always in onecolumn-mode. You can change this when moving the two commands from the preamble before the \thispagestyle command.

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