diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 0ae89d01274..ea1669fe4d4 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -4855,6 +4855,8 @@ function complete_head_from_modules($conf,$langs,$object,&$head,&$h,$type,$mode=
 				}
 				else if (count($values) == 5)       // deprecated
 				{
+					dol_syslog('Passing 5 values in tabs module_parts is deprecated. Please update to 6 with permissions.', LOG_WARNING);
+
 					if ($values[0] != $type) continue;
 					if ($values[3]) $langs->load($values[3]);
 					if (preg_match('/SUBSTITUTION_([^_]+)/i',$values[2],$reg))