diff --git a/htdocs/core/login/functions_openid.php b/htdocs/core/login/functions_openid.php
index f9172f21c87..891fb386774 100644
--- a/htdocs/core/login/functions_openid.php
+++ b/htdocs/core/login/functions_openid.php
@@ -35,7 +35,7 @@ include_once DOL_DOCUMENT_ROOT.'/core/class/openid.class.php';
  * @param	string	$usertotest		Login
  * @param	string	$passwordtotest	Password
  * @param   int		$entitytotest   Number of instance (always 1 if module multicompany not enabled)
- * @return	string					Login if OK, '' if KO
+ * @return	string|false				Login if OK, false otherwise
  */
 function check_user_password_openid($usertotest, $passwordtotest, $entitytotest)
 {