sorry, u want to WHAT to do to an additional field?
![Laughing :lol:](https://www.4homepages.de/forum/Smileys/default/icon_lol.gif)
poor additional field...lol sorry couldnt help myself...nice typo!
![Wink ;)](https://www.4homepages.de/forum/Smileys/default/icon_wink.gif)
Anyway, u can not use db_field_definitions.php for new fields for categories, its only for images and members tables.
if u need additional field for categories table, u'll need do lots of changes manualy in the code.