diff --git a/core/lib/Drupal/Core/Render/Element/Table.php b/core/lib/Drupal/Core/Render/Element/Table.php
index 2da6ef96da0..75bcab5544c 100644
--- a/core/lib/Drupal/Core/Render/Element/Table.php
+++ b/core/lib/Drupal/Core/Render/Element/Table.php
@@ -33,7 +33,8 @@ use Drupal\Component\Utility\Html as HtmlUtility;
  *   '#header' => array($this->t('Name'), $this->t('Phone')),
  * );
  *
- * for ($i=1; $i<=4; $i++) {
+ * for ($i = 1; $i <= 4; $i++) {
+ *   $form['contacts'][$i]['#attributes'] = array('class' => array('foo', 'baz'));
  *   $form['contacts'][$i]['name'] = array(
  *     '#type' => 'textfield',
  *     '#title' => $this->t('Name'),
@@ -46,6 +47,11 @@ use Drupal\Component\Utility\Html as HtmlUtility;
  *     '#title_display' => 'invisible',
  *   );
  * }
+ *
+ * $form['contacts'][]['colspan_example'] = array(
+ *   '#plain_text' => 'Colspan Example',
+ *   '#wrapper_attributes' => array('colspan' => 2, 'class' => array('foo', 'bar')),
+ * );
  * @endcode
  * @see \Drupal\Core\Render\Element\Tableselect
  *