README.md in ruby-xcdm-0.0.8 vs README.md in ruby-xcdm-0.0.9

@@ -1,11 +1,11 @@
 # ruby-xcdm
 
-This is a tool for generating the same xcdatamodeld files that XCode
+This is a tool for generating the same xcdatamodeld files that Xcode
 does when designing a datamodel for Core Data.  It is written in pure
 ruby, but it will be of particular interest to RubyMotion developers.
-It offers the essential features that XCode does, plus a text-based
+It offers the essential features that Xcode does, plus a text-based
 workflow and some niceties, like automatic inverse relationships.
 
 [![Dependency Status](https://gemnasium.com/infinitered/ruby-xcdm.png)](https://gemnasium.com/infinitered/ruby-xcdm)
 [![Build Status](https://travis-ci.org/infinitered/ruby-xcdm.png?branch=master)](https://travis-ci.org/infinitered/ruby-xcdm)
 [![Gem Version](https://badge.fury.io/rb/ruby-xcdm.png)](http://badge.fury.io/rb/ruby-xcdm)
@@ -147,9 +147,21 @@
   entity "Posting" do
     belongs_to :person
     belongs_to :thread
 
     datetime :joined_at
+  end
+```
+
+You can also have symmetric one-to-one relationships via has_one:
+
+```ruby
+  entity "Person" do
+    has_one :ego
+  end
+
+  entity "Ego" do
+    has_one :person
   end
 ```
 
 Core Data has no equivalent of ```:through``` in ActiveRecord, so you'll
 need to handle that relation yourself.