diff --git a/README.textile b/README.textile
index dbca4ba..1fac926 100644
--- a/README.textile
+++ b/README.textile
@@ -60,6 +60,13 @@ pass a different URL in, you can do that as well:
 
   edit_in_place([@list, @item], :name, :url => weird_item_path(@item))
 
+h4. If you're using a newer version of Rails...
+
+You might need to tell ActiveRecord not to include the root while serializing
+to JSON. To do so, put this line in an initializer, or environment.rb:
+
+  ActiveRecord::Base.include_root_in_json = false
+
 h3. TODO
 
 * Escape key should cancel (simple event handler)