[Rails] Simple routing problem

I've got the following in config\routes.rb:
map.resources :users

In app\views\shared\_menu.erb, I've got:
Please sign in <%= link_to
"here", :controller=>"user", :action=>"sign_in" -%>

In app\controllers\users_controller.rb
def sign_in
end

When I run the application, I crash with:
Routing Error
No route matches "/user/sign_in" with {:method=>:get}

I presume I should add "def sign_in; [snip]; end" somewhere in:
app\views\users

But where, so as to satisfy the Rails routing scheme?
Is sufficient information provided above to answer this question?
I'm running Rails 2.3.5

Thanks in Advance,
Richard

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