README.md in alba-0.7.0 vs README.md in alba-0.8.0

@@ -1,12 +1,13 @@
+[![Gem Version](https://badge.fury.io/rb/alba.svg)](https://badge.fury.io/rb/alba)
 [![Build Status](https://travis-ci.com/okuramasafumi/alba.svg?branch=master)](https://travis-ci.com/okuramasafumi/alba)
 [![Coverage Status](https://coveralls.io/repos/github/okuramasafumi/alba/badge.svg?branch=master)](https://coveralls.io/github/okuramasafumi/alba?branch=master)
 [![Maintainability](https://api.codeclimate.com/v1/badges/fdab4cc0de0b9addcfe8/maintainability)](https://codeclimate.com/github/okuramasafumi/alba/maintainability)
 
 # Alba
 
-`Alba` is a stupid, fast and easy to use JSON serializer.
+`Alba` is the fastest JSON serializer for Ruby.
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
@@ -124,15 +125,27 @@
 
 Although this might be useful sometimes, it's generally recommended to define a class for both Resource and Serializer.
 
 ## Comparison
 
-Since Alba is intended to be stupid, there are many things Alba can't do while other gems can. However, from the same reason, it's extremely faster than alternatives.
+Alba is faster than alternatives.
 For a performance benchmark, see https://gist.github.com/okuramasafumi/4e375525bd3a28e4ca812d2a3b3e5829.
 
 ## Why named "Alba"?
 
 The name "Alba" comes from "albatross", a kind of birds. In Japanese, this bird is called "Aho-dori", which means "stupid bird". I find it funny because in fact albatrosses fly really fast. I hope Alba looks stupid but in fact it does its job quick.
+
+## Alba internals
+
+Alba has three component, `Serializer`, `Resource` and `Value` (`Value` is conceptual and not implemented directly).
+
+`Serializer` is a component responsible for rendering JSON output with `Resource`. `Serializer` can add more data to `Resource` such as `metadata`. Users can define one single `Serializer` and reuse it for all `Resource`s. The main interface is `#serialize`.
+
+`Resource` is a component responsible for defining how an object (or a collection of objects) is converted into JSON. The difference between `Serializer` and `Resource` is that while `Serializer` can add arbitrary data into JSON, `Resource` can get data only from the object under it. The main interface is `#serializable_hash`.
+
+`Value` is either `Attribute`, `One` or `Many`. They are responsible for fetching data from the object for `Resource`. The main interface is `#to_hash`.
+
+The main `Alba` module holds config values and one convenience method, `.serialize`.
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.