README.rdoc in ploymorphic_wuid-0.1.0 vs README.rdoc in ploymorphic_wuid-0.2.0

@@ -11,10 +11,11 @@
 class CreateWuids < ActiveRecord::Migration
   def self.up
     create_table :wuids do |t|
       t.integer :wuidable_id
       t.string  :wuidable_type
+      t.integer :reference_to #optional
       t.timestamps
     end
   end
 
   def self.down
@@ -29,11 +30,11 @@
  
   
  in your model
 
    class Book < ActiveRecord::Base
-     acts_as_wuid
+     acts_as_wuid 
    end
  
   that's all  
 
 == Usage
@@ -43,9 +44,13 @@
     obj = Wuid.find(params[:wuid]).wuidable
 
   get an object's wuid:
  
     obj.wid
+
+== advantage
+  
+   acts_as_wuid :acts_as_tree => true
 
 == Note on Patches/Pull Requests
  
 * Fork the project.
 * Make your feature addition or bug fix.