[pdftex] bookmarks: chapter ouside of part

[Julien Ugon]

Hello,

I have a document as follows:
\chapter{Introduction}
\part{Part1}
\chapter{Chapter1}
\chapter{Chapter2}
\chapter{Conclusion}

I would like the conclusion to appear in the bookmark outside of the part1
(Just like the introduction), but I can't seem to find how I can do it, or
even if this is possible.
Would anyone have any idea on how I can do that?

Julien