diff --git a/README.md b/README.md
index 6b5e8dd..0d979ab 100644
--- a/README.md
+++ b/README.md
@@ -167,6 +167,10 @@ Callbacks can be run before, after, or around the discard and undiscard operatio
 A likely use is discarding or deleting associated records (but see "Working with associations" for an alternative).
 
 ``` ruby
+class Comment < ActiveRecord::Base
+  include Discard::Model
+end
+
 class Post < ActiveRecord::Base
   include Discard::Model