comments in Nillify module

lib/nilly_vanilly/nillify.rb

@@ -1,23 +1,28 @@
 module NillyVanilly
+  # Inject the nillifcation process in ActiveRecord
   module Nillify
     def self.included(base)
       base.extend ClassMethods
     end
 
     module ClassMethods
+
+      # Register a before_save hook to nillify attributes defined by nillify_attributes accessor
       def nillify(*attributes)
         class_eval do
           before_save :nillification
         end
-        
+
         cattr_accessor :nillify_attributes
-        self.nillify_attributes = attributes        
+        self.nillify_attributes = attributes
 
         include InstanceMethods
       end
     end
-    
+
     module InstanceMethods
+
+      # Nillify attribute if it is a empty string
       def nillification
         for attribute in self.class.nillify_attributes
           self.send("#{attribute}=", nil) if self.send(attribute) == ""