ActiveModel::Conversion documentation

activemodel/README

@@ -13,7 +13,7 @@ to then present a common interface to the Action Pack helpers.
 
 You can include functionality from the following modules:
 
-* Callbacks
+* Adding callbacks to your class
 
    class MyClass
      extend ActiveModel::Callbacks
@@ -31,3 +31,11 @@ You can include functionality from the following modules:
 
   {Learn more}[link:classes/ActiveModel/CallBacks.html]
 
+* For classes that already look like an Active Record object
+
+    class MyClass
+      include ActiveModel::Conversion
+    end
+
+    ...returns the class itself when sent :to_model
+

activemodel/lib/active_model/conversion.rb

@@ -1,5 +1,16 @@
 module ActiveModel
-  # Include ActiveModel::Conversion if your object "acts like an ActiveModel model".
+  # If your object is already designed to implement all of the Active Model featurs
+  # include this module in your Class.
+  # 
+  #   class MyClass
+  #     include ActiveModel::Conversion
+  #   end
+  # 
+  # Returns self to the <tt>:to_model</tt> method.
+  # 
+  # If your model does not act like an Active Model object, then you should define
+  # <tt>:to_model</tt> yourself returning a proxy object that wraps your object
+  # with Active Model compliant methods.
   module Conversion
     def to_model
       self