diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index ef074c6466a..cdb55c66049 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -4871,7 +4871,7 @@ class Form
 	 * 	@param	int		$forcecombo		Force to use combo box
 	 *  @param	array	$events			Event options. Example: array(array('method'=>'getContacts', 'url'=>dol_buildpath('/core/ajax/contacts.php',1), 'htmlname'=>'contactid', 'params'=>array('add-customer-contact'=>'disabled')))
 	 *  @param  int     $nooutput       No print output. Return it only.
-	 *  @return	void
+	 *  @return	void|string
 	 */
     public function form_thirdparty($page, $selected = '', $htmlname = 'socid', $filter = '', $showempty = 0, $showtype = 0, $forcecombo = 0, $events = array(), $nooutput = 0)
 	{