README.md in intro-0.3.0 vs README.md in intro-0.4.0

@@ -19,11 +19,11 @@
 
 ![example](https://user-images.githubusercontent.com/19590194/64253419-dbe38d80-cf4f-11e9-9aab-b1e6058990ab.png)
 
 ## Demo
 
-[Demo](https://intro-demo.herokuapp.com/)
+[Demo](https://intro-demo.herokuapp.com/): [Source](https://github.com/jinhucheung/intro-demo)
 
 ## Installation
 
 Add `intro` to application's Gemfile:
 
@@ -44,13 +44,19 @@
 ```
 
 Then do migrate:
 
 ```
-$ bundle exec rake db:migrate
+$ rails db:migrate
 ```
 
+Compile assets:
+
+```
+$ rails assets:precompile
+```
+
 ## Usage
 
 ### Inserting assets into view
 
 Insert `intro_tags` into common layout, just before the closing body tag:
@@ -80,14 +86,23 @@
 ```
 
 Then you would get the asset files:
 
 ```
-app/assets/stylesheets/intro/shepherd/_variables.scss
-app/assets/stylesheets/intro/shepherd/base.scss
+app/javascript/stylesheets/intro/_variables.scss
+app/javascript/stylesheets/intro/custom.scss
+app/javascript/packs/intro/custom.js
 ```
 
 Change them for your need.
+
+Last, import custom packs javascript into `intro_tag` like this:
+
+```
+<%= intro_tags do %>
+  <%= javascript_pack_tag('intro/custom') %>
+<% end %>
+```
 
 ### Configuring intro
 
 see `config/initializers/intro.rb` for detail configuration.
 
\ No newline at end of file