add_category deprecated, now what do I use?

I need something to happen when someone adds a category, but apparently add_category was removed in wp3.0, and create_category was renamed to something like create_{$taxonomy}…

What does create_{$taxonomy} mean?
(see http://adambrown.info/p/wp_hooks/hook/create_category)

Does that just mean I replace {$taxonomy} with the word “category”, as in create_category, so nothing really changed, or what?

Thanks!