README.md in letter_avatar-0.0.3 vs README.md in letter_avatar-0.0.4

@@ -11,22 +11,35 @@
 
     sudo apt-get install -y advancecomp gifsicle jhead jpegoptim libjpeg-progs optipng pngcrush pngquant
 
 Add this line to your application's Gemfile:
 
-    gem 'letter_avatar'
+```ruby
+gem 'letter_avatar'
+```
 
 And then execute:
 
     $ bundle
 
 Or install it yourself as:
 
     $ gem install letter_avatar
+    
+## Configuration
 
+```ruby
+LetterAvatar.setup do |config|
+  config.cache_base_path='public/system/lets' # default is 'public/system'
+end
+```
+
 ## Usage
 
-TODO: Write usage instructions here
+```ruby
+LetterAvatar.generate 'ksz2k', 200
+=> "public/system/letter_avatars/2/K/87_178_230/200.png"
+```
 
 ## Contributing
 
 1. Fork it
 2. Create your feature branch (`git checkout -b my-new-feature`)