diff --git a/group/externallib.php b/group/externallib.php
index f7599d739ba..5963c6e82e3 100644
--- a/group/externallib.php
+++ b/group/externallib.php
@@ -579,7 +579,7 @@ class core_group_external extends external_api {
                             'courseid' => new external_value(PARAM_INT, 'id of course'),
                             'name' => new external_value(PARAM_TEXT, 'multilang compatible name, course unique'),
                             'description' => new external_value(PARAM_RAW, 'grouping description text'),
-                            'descriptionformat' => new external_format_value('descripiton', VALUE_DEFAULT)
+                            'descriptionformat' => new external_format_value('description', VALUE_DEFAULT)
                         )
                     ), 'List of grouping object. A grouping has a courseid, a name and a description.'
                 )