Docfix (closes #8096)

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7107 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/base.rb

@@ -640,9 +640,21 @@ module ActiveRecord #:nodoc:
       end
 
 
-      # Specifies that the attribute by the name of +attr_name+ should be serialized before saving to the database and unserialized
-      # after loading from the database. The serialization is done through YAML. If +class_name+ is specified, the serialized
-      # object must be of that class on retrieval, or nil. Otherwise, +SerializationTypeMismatch+ will be raised.
+      # If you have an attribute that needs to be saved to the database as an object, and retrieved as the same object, 
+      # then specify the name of that attribute using this method and it will be handled automatically.  
+      # The serialization is done through YAML. If +class_name+ is specified, the serialized object must be of that 
+      # class on retrieval or +SerializationTypeMismatch+ will be raised.
+      #
+      # ==== Options
+      #
+      # +attr_name+   The field name that should be serialized
+      # +class_name+  Optional, class name that the object should be equal to
+      #
+      # ==== Example
+      #   # Serialize a preferences attribute
+      #   class User
+      #     serialize :preferences
+      #   end
       def serialize(attr_name, class_name = Object)
         serialized_attributes[attr_name.to_s] = class_name
       end