--- user_mailman_register.install.orig	2011-09-04 10:58:55.000000000 +0000
+++ user_mailman_register.install	2011-09-04 11:02:48.000000000 +0000
@@ -26,7 +26,7 @@
   db_add_field($ret, 'mailman_lists', 'allow_unsubscribe', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 1, 'description' => t("Allow/deny user list unsubscription")));
   db_add_field($ret, 'mailman_lists', 'allow_temp_disable', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 1, 'description' => t("Allow/deny list temporary receiving disable")));
   db_add_field($ret, 'mailman_lists', 'allow_digest', array('type' => 'int', 'size' => 'tiny', 'not null' => TRUE, 'default' => 1, 'description' => t("Allow/deny list digest subscription")));
-  db_add_field($ret, 'mailman_lists', 'description', array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'description' => t("List description")));
+  db_add_field($ret, 'mailman_lists', 'description', array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'default' => '', 'description' => t("List description")));
   db_add_field($ret, 'mailman_users', 'lchecktime', array('type' =>'int', 'not null' => TRUE, 'default' => 0, 'description' => t("Last Mailman subscription check time")));
   db_add_field($ret, 'mailman_lists', 'defaultnewreg', array('type' =>'int', 'not null' => TRUE, 'default' => 0, 'description' => t("Default choice in user registration form")));
   db_add_field($ret, 'mailman_users', 'lmod', array('type' =>'int', 'not null' => TRUE, 'default' => 0, 'description' => t("Moderation flag")));
@@ -131,3 +131,11 @@
   return $ret;
 
 }
+
+function user_mailman_register_update_6008() {
+  $ret = array();
+ 
+  db_change_field($ret, 'mailman_lists', 'description', 'description', array('type' => 'text', 'size' => 'medium', 'not null' => TRUE, 'default' => '', 'description' => t("List description")));
+
+  return $ret;
+}