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diff --git a/guides/source/action_mailer_basics.md b/guides/source/action_mailer_basics.md
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--- a/guides/source/action_mailer_basics.md
+++ b/guides/source/action_mailer_basics.md
@@ -594,4 +594,4 @@ Before the interceptor can do its job you need to register it with the Action Ma
ActionMailer::Base.register_interceptor(SandboxEmailInterceptor) if Rails.env.staging?
```
-NOTE: The example above uses a custom environment called "staging" for a production like server but for testing purposes.
+NOTE: The example above uses a custom environment called "staging" for a production like server but for testing purposes. You can read [Creating Rails environments](./configuring.html#creating-rails-environments) for more information about custom Rails environments.