# xeCJK and paragraph indentation

I am using xelatex and want to use the xeCJK package, but without indenting the first paragraph of a section. I tried the setup directive below, which should do the trick. But it does not. The manual is in Chinese ...

\documentclass{article}

\usepackage{xeCJK}
\setCJKmainfont{SimSun}
\xeCJKsetup{indentfirst=false}

\begin{document}

\section{Section 1}

I want to have a paragrpah without indentation.

This one should be indented.

\subsection{Section 2}

Same here.

This one should be indented.

\end{document}
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In the log file you find this warning:

*************************************************
* xeCJK warning: "option-invalid"
*
* The `indentfirst' option only can be set in the optional argument to the
* \usepackage command when xeCJK is being loaded.
*
* Please do not set it via the \xeCJKsetup command.
*************************************************

which is self-explanatory: do

\usepackage[indentfirst=false]{xeCJK}

Be warned that languages loaded with Polyglossia may revert the setting (Italian, for instance).

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