diff --git a/MediaBrowser.Model/Entities/CollectionType.cs b/MediaBrowser.Model/Entities/CollectionType.cs
index 60509567e0..87cb336d99 100644
--- a/MediaBrowser.Model/Entities/CollectionType.cs
+++ b/MediaBrowser.Model/Entities/CollectionType.cs
@@ -18,5 +18,7 @@ namespace MediaBrowser.Model.Entities
         public const string BoxSets = "boxsets";
 
         public const string AdultVideos = "adultvideos";
+
+        public const string Books = "books";
     }
 }