1 files changed, 24 insertions, 1 deletions
diff --git a/guides/source/active_model_basics.md b/guides/source/active_model_basics.md
index 1d87646e49..3eaeeff389 100644
--- a/guides/source/active_model_basics.md
+++ b/guides/source/active_model_basics.md
@@ -120,8 +120,8 @@ class Person
   end
 
   def save
-    @previously_changed = changes
     # do save work...
+    changes_applied
   end
 end
 ```
@@ -198,3 +198,26 @@ person.valid?                        # => true
 person.token = nil
 person.valid?                        # => raises ActiveModel::StrictValidationFailed
 ```
+
+### ActiveModel::Naming
+
+Naming adds a number of class methods which make the naming and routing
+easier to manage. The module defines the `model_name` class method which
+will define a number of accessors using some `ActiveSupport::Inflector` methods.
+
+```ruby
+class Person
+  extend ActiveModel::Naming
+end
+
+Person.model_name.name                # => "Person"
+Person.model_name.singular            # => "person"
+Person.model_name.plural              # => "people"
+Person.model_name.element             # => "person"
+Person.model_name.human               # => "Person"
+Person.model_name.collection          # => "people"
+Person.model_name.param_key           # => "person"
+Person.model_name.i18n_key            # => :person
+Person.model_name.route_key           # => "people"
+Person.model_name.singular_route_key  # => "person"
+```