function pluginPrefix_rechercher_liste_des_jointures($tables){

	// search in the BIO field of authors when we search in the articles
	$tables['article']['auteur']['bio'] = 2;

	// search in the text of the keywords
	$tables['article']['mot']['texte'] = 2;

	// do not search in the documents
	unset($tables['article']['document']);

	return $tables;
}