README.md in rails-uploader-0.5.2 vs README.md in rails-uploader-0.5.3

@@ -39,9 +39,26 @@
 
   def thumb_url
     url(:thumb)
   end
 end
+
+class PictureUploader < CarrierWave::Uploader::Base
+  include CarrierWave::MiniMagick
+
+  # Choose what kind of storage to use for this uploader:
+  storage :file
+
+  EXTENSION_WHITELIST = %w[jpg jpeg gif png].freeze
+
+  version :thumb do
+    process resize_to_fill: [100, 100]
+  end
+
+  def extension_whitelist
+    EXTENSION_WHITELIST
+  end
+end
 ```
 
 For example user has one picture:
 
 ``` ruby