diff --git a/demo/config/application.rb b/demo/config/application.rb
index 93cbfa6f23..868d75f72d 100644
--- a/demo/config/application.rb
+++ b/demo/config/application.rb
@@ -10,6 +10,7 @@
 require "primer/view_components"
 require "primer/view_components/engine"
 require "octicons"
+require_relative "../../lib/primer/yard"
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.