Fixed a build error

javiereguiluz · javiereguiluz · commit fbb493dc0dcc · 2018-10-25T08:57:41.000+02:00
diff --git a/serializer.rst b/serializer.rst
@@ -209,6 +209,7 @@ take a look at how this bundle works.
 .. toctree::
     :maxdepth: 1
 
+    serializer/normalizers
     serializer/custom_encoders
     serializer/custom_normalizer
 
