diff --git a/core/includes/common.inc b/core/includes/common.inc
index 0ca6918..62dba1c 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3043,7 +3043,7 @@ function drupal_render_page($page) {
  *       '#attributes' => array('class' => array('foo')),
  *       '#theme_wrappers' => array(
  *         'container' => array(
- *           '#attributes' => array('class' => 'bar'),
+ *           '#attributes' => array('class' => array('bar')),
  *         ),
  *       ),
  *     );