diff --git a/htdocs/core/tpl/extrafields_list_array_fields.tpl.php b/htdocs/core/tpl/extrafields_list_array_fields.tpl.php
index d2d77cf3b5c..bbc5ba3370b 100644
--- a/htdocs/core/tpl/extrafields_list_array_fields.tpl.php
+++ b/htdocs/core/tpl/extrafields_list_array_fields.tpl.php
@@ -1,6 +1,6 @@
 <?php
-
-print '<!-- extrafields_list_array_fields.tpl.php -->'."\n";
+// This tpl file is included into the init part of pages, so before action.
+// So no output must be done.
 
 // Protection to avoid direct call of template
 if (empty($conf) || !is_object($conf))