Add taxonomy to already registered custom post type

Question

I want to add taxonomy to already registered custom post type. Is it possible or I have to delete and create that custom post type again??

Answer 1

You want to use the register_taxonomy_for_object_type function documented here

add_action('init','fix_my_tax');    
function fix_my_tax(){
    register_taxonomy_for_object_type('taxonomy', 'post_type');
}