Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.306
diff -u -p -r1.306 system.install
--- modules/system/system.install	3 Feb 2009 12:30:14 -0000	1.306
+++ modules/system/system.install	16 Feb 2009 11:05:12 -0000
@@ -3213,6 +3213,16 @@ function system_update_7018() {
 }
 
 /**
+ * Add an index to the {node} table on language.
+ */
+function system_update_7019() {
+  $ret = array();
+  db_add_index($ret, 'node', 'node_language', array('language'));
+
+  return $ret;
+}
+
+/**
  * @} End of "defgroup updates-6.x-to-7.x"
  * The next series of updates should start at 8000.
  */