readme updates for details on accepts_nested_attributes_for

README.rdoc

@@ -24,7 +24,7 @@ Running the generator will add a file at <tt>public/javascripts/nested_form.js</
 
 == Usage
 
-Imagine you have a <tt>Project</tt> model that <tt>has_many :tasks</tt>. To be able to use this gem, you'll need to add <tt>accepts_nested_attributes_for :tasks</tt> to your Project model. If you don't have the <tt>accepts_nested_attributes_for :tasks</tt> you'll get a Missing Block Error.
+Imagine you have a <tt>Project</tt> model that <tt>has_many :tasks</tt>. To be able to use this gem, you'll need to add <tt>accepts_nested_attributes_for :tasks</tt> to your Project model. If you wish to allow the nested objects to be destroyed, then add the <tt>:allow_destroy => true</tt> option to that declaration. If you don't have the <tt>accepts_nested_attributes_for :tasks</tt> you'll get a Missing Block Error. See the {accepts_nested_attributes_for documentation}[http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for] for details on all available options.
 
 This will create a <tt>tasks_attributes=</tt> method, so you may need to add it to the <tt>attr_accessible</tt> array. (<tt>attr_accessible :tasks_attributes</tt>)