diff --git a/book/generated-xml/persistent.xml b/book/generated-xml/persistent.xml
index 80566fe..a74c38e 100644
--- a/book/generated-xml/persistent.xml
+++ b/book/generated-xml/persistent.xml
@@ -348,6 +348,8 @@ pass it off to other Persistent functions.</simpara>
 {-# LANGUAGE QuasiQuotes                #-}
 {-# LANGUAGE TemplateHaskell            #-}
 {-# LANGUAGE TypeFamilies               #-}
+{-# LANGUAGE StandaloneDeriving         #-}
+{-# LANGUAGE FlexibleInstances          #-}
 
 import           Control.Monad.IO.Class  (liftIO)
 import           Database.Persist