diff --git a/lib/classes/persistent.php b/lib/classes/persistent.php
index ac214b0d7c2..16095d6bed3 100644
--- a/lib/classes/persistent.php
+++ b/lib/classes/persistent.php
@@ -389,7 +389,7 @@ abstract class persistent {
      * represent what is stored in the database.
      *
      * @param \stdClass $record A DB record.
-     * @return persistent
+     * @return static
      */
     final public function from_record(stdClass $record) {
         $record = (array) $record;
@@ -419,7 +419,7 @@ abstract class persistent {
     /**
      * Load the data from the DB.
      *
-     * @return persistent
+     * @return static
      */
     final public function read() {
         global $DB;
@@ -452,7 +452,7 @@ abstract class persistent {
     /**
      * Insert a record in the DB.
      *
-     * @return persistent
+     * @return static
      */
     final public function create() {
         global $DB, $USER;
@@ -800,7 +800,7 @@ abstract class persistent {
      * @param int $skip Limitstart.
      * @param int $limit Number of rows to return.
      *
-     * @return \core\persistent[]
+     * @return static[]
      */
     public static function get_records($filters = array(), $sort = '', $order = 'ASC', $skip = 0, $limit = 0) {
         global $DB;
@@ -824,7 +824,7 @@ abstract class persistent {
      * Load a single record.
      *
      * @param array $filters Filters to apply.
-     * @return false|\core\persistent
+     * @return false|static
      */
     public static function get_record($filters = array()) {
         global $DB;
@@ -842,7 +842,7 @@ abstract class persistent {
      * @param string $fields
      * @param int $limitfrom
      * @param int $limitnum
-     * @return \core\persistent[]
+     * @return static[]
      */
     public static function get_records_select($select, $params = null, $sort = '', $fields = '*', $limitfrom = 0, $limitnum = 0) {
         global $DB;