Since script/generate devise_install is a required step, move README over there.

generators/devise/devise_generator.rb

@@ -4,18 +4,11 @@ class DeviseGenerator < Rails::Generator::NamedBase
 
   def manifest
     record do |m|
-      # Model
       m.directory(File.join('app', 'models', class_path))
       m.template 'model.rb', File.join('app', 'models', "#{file_path}.rb")
 
-      # Migration
       m.migration_template 'migration.rb', 'db/migrate', :migration_file_name => "devise_create_#{table_name}"
-
-      # Routing
       m.route_devise table_name
-
-      # Readme
-      m.readme "README"
     end
   end
 

generators/devise_install/devise_install_generator.rb

@@ -7,6 +7,8 @@ class DeviseInstallGenerator < Rails::Generator::Base
 
       m.directory "config/locales"
       m.file      "../../../lib/devise/locales/en.yml", "config/locales/devise.en.yml"
+
+      m.readme "README"
     end
   end
 

generators/devise_install/templates/README

@@ -3,11 +3,7 @@
 
 Some setup you must do manually if you haven't yet:
 
-  1. Run devise install generator:
-
-       ruby script/generate devise_install
-
-  2. Setup defaut url options for your specific environment. Here is an
+  1. Setup default url options for your specific environment. Here is an
      example of development environment:
 
        config.action_mailer.default_url_options = { :host => 'localhost:3000' }
@@ -15,7 +11,7 @@ Some setup you must do manually if you haven't yet:
      This is a required Rails configuration. In production is must be the
      actual host of your application
 
-  3. Ensure you have defined root_url to *something* in your config/routes.rb:
+  2. Ensure you have defined root_url to *something* in your config/routes.rb:
 
        map.root :controller => 'home'