diff --git a/railties/guides/source/2_3_release_notes.textile b/railties/guides/source/2_3_release_notes.textile
index cc2e2dc20c..7f617a6763 100644
--- a/railties/guides/source/2_3_release_notes.textile
+++ b/railties/guides/source/2_3_release_notes.textile
@@ -365,6 +365,17 @@ You can write this view in Rails 2.3:
 <% end %>
 </erb>
 
+When nesting across a +has_one+ relationship you will need to create a new blank object for the nested object before calling +fields_for+ in the view. 
+
+A +build_&lt;model_name&gt;+ method has been created for this purpose:
+
+<erb>
+	<% @customer.build_order unless @customer.order %>
+	<% customer_form.fields_for :orders do |order_form| %>
+</erb>
+
+Otherwise +@customer.order+ will return +nil+ and your form will fail. +has_many+ relationships do not require this extra step.
+
 * Lead Contributor: "Eloy Duran":http://www.superalloy.nl/blog/
 * More Information:
 ** "Nested Model Forms":http://weblog.rubyonrails.org/2009/1/26/nested-model-forms