diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 0f5070f2885..aa2f014c7ba 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -111,7 +111,7 @@ class ExtraFields
 	 *  @param  string	$elementtype        Element type ('member', 'product', 'thirdparty', ...)
 	 *  @param	int		$unique				Is field unique or not
 	 *  @param	int		$required			Is field required or not
-	 *  @param	string	$default_value		Defaulted value
+	 *  @param	string	$default_value		Defaulted value (Example: '', '0', 'null', 'avalue')
 	 *  @param  array	$param				Params for field
 	 *  @param  int		$alwayseditable		Is attribute always editable regardless of the document status
 	 *  @param	string	$perms				Permission to check