diff --git a/Database/Persist/MongoDB.hs b/Database/Persist/MongoDB.hs
--- a/Database/Persist/MongoDB.hs
+++ b/Database/Persist/MongoDB.hs
@@ -428,12 +428,12 @@
         isNull (PersistList l) = null l
         isNull _ = False
 
-        -- make sure to removed nulls from embedded entities also
-        embeddedVal :: Maybe (EntityDef a) -> PersistValue -> DB.Value
-        embeddedVal (Just emDef) (PersistMap m) = DB.Doc $
-          zipFilter (entityFields emDef) $ map snd m
-        embeddedVal je@(Just _) (PersistList l) = DB.Array $ map (embeddedVal je) l
-        embeddedVal _ _ = DB.val pv
+    -- make sure to removed nulls from embedded entities also
+    embeddedVal :: Maybe (EntityDef a) -> PersistValue -> DB.Value
+    embeddedVal (Just emDef) (PersistMap m) = DB.Doc $
+      zipFilter (entityFields emDef) $ map snd m
+    embeddedVal je@(Just _) (PersistList l) = DB.Array $ map (embeddedVal je) l
+    embeddedVal _ pv = DB.val pv
 
 collectionName :: (PersistEntity record) => record -> Text
 collectionName = unDBName . entityDB . entityDef . Just
@@ -653,7 +653,7 @@
       -- However, I don't think an end user ever wants that.
       FilterOr fs  -> multiFilter OrDollar fs
       -- Ignore an empty filter list instead of throwing an exception.
-      -- $and is necessary in only a few cases, but it makes query construction easier
+      -- \$and is necessary in only a few cases, but it makes query construction easier
       FilterAnd [] -> []
       FilterAnd fs -> multiFilter AndDollar fs
 
diff --git a/persistent-mongoDB.cabal b/persistent-mongoDB.cabal
--- a/persistent-mongoDB.cabal
+++ b/persistent-mongoDB.cabal
@@ -1,5 +1,5 @@
 name:            persistent-mongoDB
-version:         1.4.4.1
+version:         1.4.4.2
 license:         MIT
 license-file:    LICENSE
 author:          Greg Weber <greg@gregweber.info>