diff --git a/README.md b/README.md
index e0a7555..b7249ff 100644
--- a/README.md
+++ b/README.md
@@ -22,13 +22,16 @@ Set up environment running
 bin/rails graphiti:openapi:install
 ```
 
-Configure OpenAPI template in `config/openapi.yml` and Graphiti::OpenAPI will pick your resources schema and
-translate it to OpenAPI 3.0 JSON and YAML files, providing Swagger UI with live API documentation.
-
 ## Usage
 
 Edit template in `config/openapi.yml` to customize your OpenAPI output. This file will be used as base for resulting
-document.
+document. Generate it by executing
+
+```bash
+bin/rails graphiti:openapi:generate
+```
+
+Results will be saved in `public/#{ApplicationResource.endpoint_namespace}/openapi.json` and `.../openapi.yaml`
 
 ## Development
 
diff --git a/lib/graphiti/open_api.rb b/lib/graphiti/open_api.rb
index 829f0d4..c9dc21c 100644
--- a/lib/graphiti/open_api.rb
+++ b/lib/graphiti/open_api.rb
@@ -2,8 +2,6 @@
 
 module Graphiti
   module OpenApi
-    class Error < StandardError
-    end
   end
 end
 
diff --git a/lib/graphiti/open_api/engine.rb b/lib/graphiti/open_api/engine.rb
index ff76604..44c7ae8 100644
--- a/lib/graphiti/open_api/engine.rb
+++ b/lib/graphiti/open_api/engine.rb
@@ -1,15 +1,10 @@
 require "rails"
-require "responders"
 require "graphiti"
 
 module Graphiti
   module OpenApi
     class Engine < ::Rails::Engine
       isolate_namespace Graphiti::OpenApi
-
-      initializer "graphiti.openapi.init" do
-        Mime::Type.register "text/yaml", :yaml
-      end
     end
   end
 end
diff --git a/lib/templates/installer.rb b/lib/templates/installer.rb
index 1a2fe45..b5186b3 100644
--- a/lib/templates/installer.rb
+++ b/lib/templates/installer.rb
@@ -1,8 +1,4 @@
 root = File.expand_path("../..", __dir__)
-packs = File.directory?("app/assets/packs") ? "app/assets/packs" : "app/javascripts/packs"
-
-say "Copying api.js to #{packs}/"
-copy_file "#{root}/app/assets/packs/api.js", "#{packs}/api.js"
 
 say "Copying openapi.yml to config/"
 copy_file "#{root}/config/openapi.yml", "config/openapi.yml"
@@ -15,6 +11,3 @@
     public/api/v1/openapi.yaml
   IGNORE
 end
-
-say "Installing JavaScript dependencies"
-run "yarn add swagger-ui"