Index: wp-admin/update-core.php
===================================================================
--- wp-admin/update-core.php	(revision 15771)
+++ wp-admin/update-core.php	(working copy)
@@ -138,6 +138,7 @@
 		_e( 'An updated version of WordPress is available.' );
 		echo '</h3>';
 	}
+	echo '<a href="' . esc_url('update-core.php') . '" class="button">' . __('Check Again') . '</a>&nbsp;';
 
 	echo '<ul class="core-updates">';
 	$alternate = true;