SQL Error in upgrading

[VikG]

I got the following 3 errors on upgrade:

SET NAMES 'utf8'

ALTER TABLE `ps_tab_lang` MODIFY `id_lang` int(10) unsigned NOT NULL AFTER `id_tab`

ALTER TABLE `ps_carrier` ADD `is_free` tinyint(1) unsigned NOT NULL DEFAULT '0' AFTER `is_module`


does this mean anything or is it ok to proceed?

(V1.4.2.5)

I have already succesfully upgraded to v1.4 last month so its just the small upgrade (total of 62 changes)