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-rw-r--r--guides/source/upgrading_ruby_on_rails.md17
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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
@@ -183,6 +183,23 @@ end
ActiveRecord::FixtureSet.context_class.send :include, FixtureFileHelpers
```
+### I18n enforcing available locales
+
+Rails 4.1 now defaults the I18n option `enforce_available_locales` to `true`,
+meaning that it will make sure that all locales passed to it must be declared in
+the `available_locales` list.
+
+To disable it (and allow I18n to accept *any* locale option) add the following
+configuration to your application:
+
+```ruby
+config.i18n.enforce_available_locales = false
+```
+
+Note that this option was added as a security measure, to ensure user input could
+not be used as locale information unless previously known, so it's recommended not
+to disable this option unless you have a strong reason for doing so.
+
Upgrading from Rails 3.2 to Rails 4.0
-------------------------------------