diff --git a/lib/ad_banner/engine.rb b/lib/ad_banner/engine.rb
index cfc045f..bcfa081 100644
--- a/lib/ad_banner/engine.rb
+++ b/lib/ad_banner/engine.rb
@@ -6,6 +6,7 @@ module AdBanner
         base_url File.expand_path File.dirname(__FILE__)
         widget_methods ["widget"]
         widget_settings [{"override_category_with"=>"banner","multiselect"=>false,"display_field"=>"title"}]
+        models_to_cache [:banner,:ad_image]
         taggable "Banner"
         categorizable
         authorizable