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-rw-r--r--guides/source/upgrading_ruby_on_rails.md16
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diff --git a/guides/source/upgrading_ruby_on_rails.md b/guides/source/upgrading_ruby_on_rails.md
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+++ b/guides/source/upgrading_ruby_on_rails.md
@@ -276,6 +276,22 @@ class Notifier < ActionMailer::Base
end
```
+### Foreign Key Support
+
+The migration DSL has been expanded to support foreign key definitions. If
+you've been using the Foreigner gem, you might want to consider removing it.
+Note that the foreign key support of Rails is a subset of Foreigner. This means
+that not every Foreigner definition can be fully replaced by it's Rails
+migration DSL counterpart.
+
+The migration procedure is as follows:
+
+1. remove `gem "foreigner"` from the Gemfile.
+2. run `bundle install`.
+3. run `bin/rake db:schema:dump`.
+4. make sure that `db/schema.rb` contains every foreign key definition with
+the necessary options.
+
Upgrading from Rails 4.0 to Rails 4.1
-------------------------------------