diff --git a/grade/edit/tree/index.php b/grade/edit/tree/index.php
index e0366d06e5f..4d22c2f55c1 100644
--- a/grade/edit/tree/index.php
+++ b/grade/edit/tree/index.php
@@ -160,6 +160,9 @@ echo '</div>';
 print_footer($course);
 die;
 
+/**
+ * TODO document
+ */
 function print_grade_tree(&$gtree, $element, $moving, &$gpr, $switch, $switchedlast=false) {
     global $CFG, $COURSE;
 
diff --git a/grade/lib.php b/grade/lib.php
index bb70c97ed99..c1da8f9a5eb 100644
--- a/grade/lib.php
+++ b/grade/lib.php
@@ -800,7 +800,7 @@ class grade_tree {
         $order = key($element['children']);
         unset($element['children'][$order]);
         $element['children'][$order] =& $category_item;
-        foreach ($element['children'] as $sortorder=>$child) {
+        foreach ($element['children'] as $sortorder => $child) {
             grade_tree::category_grade_last($element['children'][$sortorder]);
         }
     }