diff --git a/guides/source/active_record_basics.md b/guides/source/active_record_basics.md
index b57e893275eff..677c577092d6a 100644
--- a/guides/source/active_record_basics.md
+++ b/guides/source/active_record_basics.md
@@ -395,3 +395,23 @@ PostgreSQL, Oracle, and others.
 
 You can learn more about migrations in the [Active Record Migrations
 guide](active_record_migrations.html).
+
+Associations
+------------
+
+Active Record associations allow you to define relationships between models.
+Associations can be used to describe one-to-one, one-to-many, and many-to-many
+relationships. For example, a relationship like “Author has many Books” can be
+defined as follows:
+
+```ruby
+class Author < ApplicationRecord
+  has_many :books
+end
+```
+
+The Author class now has methods to add and remove books to an author, and much
+more.
+
+You can learn more about associations in the [Active Record Associations
+guide](associations_basics.html).