Himanshu Jhaloya
--- a/core/modules/migrate/src/Plugin/MigrateDestinationInterface.php
+++ b/core/modules/migrate/src/Plugin/MigrateDestinationInterface.php
   * @param \Drupal\migrate\Row $row
   *   The row object.
   * @param array $old_destination_id_values
-   *   (optional) The old destination IDs. Defaults to an empty array.
+   *   (optional) The previous destination IDs. This parameter represents the values from the migrate map for the destination entity if this source has previously been migrated already. It is empty the first time you migrate a source row, and contains the map's destination ID values on a subsequent update. Defaults to an empty array.