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

@@ -113,20 +113,29 @@
       photo.striped_image.write
     }
   end
 ```
 
-
 # Custom configure example
 
 ```ruby
 # Save to S3 bucket.
 require 'tori/backend/s3'
 Tori.config.backend = Tori::Backend::S3.new(bucket: 'tori_bucket')
 
 # Filename decided by model.class.name,id and hidden words.
 Tori.config.filename_callback do |model|
   "#{model.class.name}/#{Digest::SHA1.hexdigest "#{ENV["TORI_MAGICKWORD"]}/#{model.id}"}"
+end
+
+# You can change any way define filename.
+Tori.config.filename_callback do |model|
+  # `__tori__` method is meta name of defined by `tori` method.
+  "#{model.class.name}/#{__tori__}/#{model.title}"
+  # class Photo
+  #   tori :orig #=> "Photo/orig/cool-shot.png"
+  #   tori :strip #=> "Photo/strip/cool-shot.png"
+  # end
 end
 ```
 
 # Default configure