[Koha] Adding new item type icons

[Paul Yachnes]

How do I add new item type icons to my selection in Koha 3.0.1? In Koha 
3.0, all I had to do was add a new folder of icons to the itemtypeimg 
folder and they would show up under a separate section on the Add Item 
Type and Modify Item Type pages. In 3.0.1 where there is a separate tab 
on these pages for each folder of icons, no tab appears for my new 
folder. What else do I need to do? Thanks.

Paul