1 files changed, 10 insertions, 0 deletions
diff --git a/includes/common.inc b/includes/common.inc
index 94a5cc537..b6963c677 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -1957,6 +1957,16 @@ function drupal_get_js($scope = 'header', $javascript = NULL) {
  * $form['my_elements'][$delta]['weight']['#attributes']['class'] = "my-elements-weight";
  * @endcode
  *
+ * Each row of the table must also have a class of "draggable" in order to enable the
+ * drag handles:
+ * @code
+ * $row = array(...);
+ * $rows[] = array(
+ *   'data' => $row,
+ *   'class' => 'draggable',
+ * );
+ * @endcode
+ * 
  * Calling drupal_add_tabledrag() would then be written as such:
  * @code
  * drupal_add_tabledrag('my-module-table', 'order', 'sibling', 'my-elements-weight');