diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index feb41f5dffd..472ecbb40e5 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -1268,7 +1268,7 @@ function dol_delete_dir($dir,$nophperrors=0)
  *  @param  int		$nophperrors    Disable all PHP output errors
  *  @param	int		$onlysub		Delete only files and subdir, not main directory
  *  @param  int		$countdeleted   Counter to count nb of elements found really deleted
- *  @return int             		Number of files and directory we try to remove. NB really removed is returned into $countdeleted.
+ *  @return int             		Number of files and directory we try to remove. NB really removed is returned into var by reference $countdeleted.
  */
 function dol_delete_dir_recursive($dir, $count=0, $nophperrors=0, $onlysub=0, &$countdeleted=0)
 {