diff --git a/src/GridFieldOrderableRows.php b/src/GridFieldOrderableRows.php
index c2dda2b..cc2b930 100755
--- a/src/GridFieldOrderableRows.php
+++ b/src/GridFieldOrderableRows.php
@@ -588,7 +588,8 @@ protected function reorderItems($list, array $values, array $sortedIDs)
         // sanity check.
         $this->validateSortField($list);
 
-        // ManyManyList models are not represented by the ORM, and so they need to be updated through an SQL Query
+        // ManyManyList extra fields aren't easily updated via the ORM, and so they need to be updated through an SQL
+        // Query
         if ($list instanceof ManyManyList) {
             $sortTable = $this->getSortTable($list);