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-rw-r--r--guides/source/upgrading_ruby_on_rails.md4
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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
@@ -47,6 +47,10 @@ Rails 4.0 no longer supports loading plugins from `vendor/plugins`. You must rep
* Rails 4.0 has removed `attr_accessible` and `attr_protected` feature in favor of Strong Parameters. You can use the [Protected Attributes gem](https://github.com/rails/protected_attributes) to a smoothly upgrade path.
+### Active Resource
+
+Rails 4.0 extracted Active Resource to its our gem. If you still need the feature you can add the [Active Resource gem](https://github.com/rails/activeresource) in your Gemfile.
+
### Active Model
* Rails 4.0 has changed how errors attach with the `ActiveModel::Validations::ConfirmationValidator`. Now when confirmation validations fail the error will be attached to `:#{attribute}_confirmation` instead of `attribute`.