Index: core/filter.inc
===================================================================
--- core/filter.inc	1 Jun 2009 21:52:04 -0000	1.1.2.4.2.1
+++ core/filter.inc	16 Jun 2009 16:30:37 -0000
@@ -49,6 +79,15 @@ function install_remove_filter($format_i
 }
 
 /**
+* Add a filter to an input format. Note: This function is deprecated.
+*
+* @see install_set_filter()
+*/
+function install_add_filter($format_id, $module, $delta = 0, $weight = 0) {
+  install_set_filter($format_id, $module, $delta, $weight);
+}
+
+/**
  * Update an existing a filter or insert a new one if not present.
  *
  * @param $format_id