Index: wp-admin/tools.php
===================================================================
--- wp-admin/tools.php	(revision 25634)
+++ wp-admin/tools.php	(working copy)
@@ -64,6 +64,13 @@
 endif;
 endif;
 
+/**
+ * Fires actions to be run before end end of the tool-box wrapper.
+ *
+ * Can be used to print out additional tool-box divs.
+ *
+ * @since 2.8.0
+ */
 do_action( 'tool_box' );
 ?>
 </div>