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-rw-r--r--guides/source/4_0_release_notes.md1
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diff --git a/guides/source/4_0_release_notes.md b/guides/source/4_0_release_notes.md
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@@ -7,7 +7,6 @@ Highlights in Rails 4.0:
* Strong Parameters
* Turbolinks
* Russian Doll Caching
-* Asynchronous Mailers
These release notes cover only the major changes. To know about various bug fixes and changes, please refer to the change logs or check out the [list of commits](https://github.com/rails/rails/commits/master) in the main Rails repository on GitHub.