Index: src/bp-groups/bp-groups-functions.php
===================================================================
--- src/bp-groups/bp-groups-functions.php	(revision 11195)
+++ src/bp-groups/bp-groups-functions.php	(working copy)
@@ -704,9 +704,9 @@
 		'exclude'            => false,          // Do not include these specific groups (group_ids).
 		'parent_id'          => null,           // Get groups that are children of the specified group(s).
 		'search_terms'       => false,          // Limit to groups that match these search terms.
-		'group_type'         => '',
-		'group_type__in'     => '',
-		'group_type__not_in' => '',
+		'group_type'         => '',             // Array or comma-separated list of group types to limit results to.
+		'group_type__in'     => '',             // Array or comma-separated list of group types to limit results to.
+		'group_type__not_in' => '',             // Array or comma-separated list of group types that will be excluded from results.
 		'meta_query'         => false,          // Filter by groupmeta. See WP_Meta_Query for syntax.
 		'show_hidden'        => false,          // Show hidden groups to non-admins.
 		'per_page'           => 20,             // The number of results to return per page.