diff --git a/install/db/83-database.php b/install/db/83-database.php
new file mode 100644
index 000000000..1f67811ab
--- /dev/null
+++ b/install/db/83-database.php
@@ -0,0 +1,52 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based picture gallery                                  |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008-2009 Piwigo Team                  http://piwigo.org |
+// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
+// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
+// +-----------------------------------------------------------------------+
+// | This program is free software; you can redistribute it and/or modify  |
+// | it under the terms of the GNU General Public License as published by  |
+// | the Free Software Foundation                                          |
+// |                                                                       |
+// | This program is distributed in the hope that it will be useful, but   |
+// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
+// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
+// | General Public License for more details.                              |
+// |                                                                       |
+// | You should have received a copy of the GNU General Public License     |
+// | along with this program; if not, write to the Free Software           |
+// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA.                                                                  |
+// +-----------------------------------------------------------------------+
+
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+$upgrade_description = 'Update column save author_id with value.';
+
+$query = '
+UPDATE '.COMMENTS_TABLE.' AS c , '.USERS_TABLE.' AS u
+SET c.author_id = u.'.$conf['user_fields']['id'].'
+WHERE c.author = u.'.$conf['user_fields']['username'].' AND c.author_id is null
+;';
+
+pwg_query($query);
+
+$query = '
+UPDATE '.COMMENTS_TABLE.' AS c 
+SET c.author_id = '.$conf['guest_id'].'
+WHERE c.author_id is null
+;';
+
+pwg_query($query);
+
+echo
+"\n"
+. $upgrade_description
+."\n"
+;
+?>