[Koha] additional fields in items table

Dear list members, I need to add some additional fields on the item level of our records. For now, I decided to fill notes field in koha.items table with that data, but I am not satisfied because my data have specific meaning. What shoud I do? Is it advisable to add more fields in items table, or shoud I stick with what I already have? Marijana --- Marijana Glavica Faculty of Humanities and Social Sciences Libraries I. Lucica 3, 10000 Zagreb, Croatia http://www.knjiznice.ffzg.hr