Rails 3 route appends _index to route name

I am migrating a Rails 2.3.8 version to Rails 3.0 and so ive rewritten my routes file. When i list the routes using rake routes, i see some route names have _index appended to them. I cant figure out why this is.

Relevant routes:

Rails 2.3.8:

map.namespace "tracker", :path_prefix => "" do |planner|
    planner.resources :planner, :collection => {:step1 => :get,
                                                :add => :get,
                                                :unsubscribe => [:get, :post] }
end

Rails 3.0 route:

namespace "tracker", :path => "" do
  resources :planner do
    collection do
      get :step1
      get :add
      get :unsubscribe
      post :unsubscribe
    end
  end
end

Output from rake routes

Rails 2.3.8

step1_tracker_planner        GET    /planner/step1(.:format)
add_tracker_planner          GET    /planner/add(.:format)
unsubscribe_tracker_planner  GET    /planner/unsubscribe(.:format)
                             POST   /planner/unsubscribe(.:format) 

Rails 3.0

step1_tracker_planner_index       GET    /planner/step1(.:format)
add_tracker_planner_index         GET    /planner/add(.:format)
unsubscribe_tracker_planner_index GET    /planner/unsubscribe(.:format)
                                  POST   /planner/unsubscribe(.:format) 

Any ideas as to why this _index is being added would be much appreciated.