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Upgrading to Rails 5.1
----------------------
-ToDo
+If you're upgrading an existing application, it's a great idea to have good test
+coverage before going in. You should also first upgrade to Rails 5.0 in case you
+haven't and make sure your application still runs as expected before attempting
+an update to Rails 5.1. A list of things to watch out for when upgrading is
+available in the
+[Upgrading Ruby on Rails](upgrading_ruby_on_rails.html#upgrading-from-rails-5-0-to-rails-5-1)
+guide.
+
Major Features
--------------