Index: src/wp-admin/includes/template.php
===================================================================
--- src/wp-admin/includes/template.php	(revision 26862)
+++ src/wp-admin/includes/template.php	(working copy)
@@ -806,7 +806,7 @@
  * @param string $title Title of the meta box.
  * @param string $callback Function that fills the box with the desired content. The function should echo its output.
  * @param string|object $screen Optional. The screen on which to show the box (post, page, link). Defaults to current screen.
- * @param string $context Optional. The context within the page where the boxes should show ('normal', 'advanced').
+ * @param string $context Optional. The context within the page where the boxes should show ('normal', 'advanced', 'side').
  * @param string $priority Optional. The priority within the context where the boxes should show ('high', 'low').
  * @param array $callback_args Optional. Data that should be set as the "args" property of the box array (which is the second parameter passed to your callback).
  */