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diff --git a/README.md b/README.md
index bbe3a6731d..2bc35fa63d 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,8 @@ and may also be used independently outside Rails.
 We encourage you to contribute to Ruby on Rails! Please check out the
 [Contributing to Ruby on Rails guide](http://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html) for guidelines about how to proceed. [Join us!](http://contributors.rubyonrails.org)
 
+Everyone interacting in Rails and its sub-project’s codebases, issue trackers, chat rooms, and mailing lists is expected to follow the Rails [code of conduct](CODE_OF_CONDUCT.md).
+
 ## Code Status
 
 [![Build Status](https://travis-ci.org/rails/rails.svg?branch=master)](https://travis-ci.org/rails/rails)