diff --git a/include/api.php b/include/api.php
index 724568279a..b6181ea1a4 100644
--- a/include/api.php
+++ b/include/api.php
@@ -946,7 +946,7 @@ function api_create_xml($data, $root_element)
  * @param string $type         Return type (atom, rss, xml, json)
  * @param array  $data         JSON style array
  *
- * @return (string|object) XML data or JSON data
+ * @return (string|object|array) XML data or JSON data
  */
 function api_format_data($root_element, $type, $data)
 {