diff --git a/README.rdoc b/README.rdoc
index 024061c4b5..8c706b5385 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -1590,6 +1590,8 @@ is recommended:
     end
   end
 
+Note: If you are using Sinatra in the modular style, replace <tt>Sinatra::Application</tt> above with the class name of your app.
+
 == Sinatra::Base - Middleware, Libraries, and Modular Apps
 
 Defining your app at the top-level works well for micro-apps but has