README.md in avromatic-0.14.0.rc1 vs README.md in avromatic-0.14.0

@@ -57,12 +57,12 @@
   so that they can be referenced by id. Either `schema_registry` or 
   `registry_url` must be configured.
 * **registry_url**: URL for the schema registry. Either `schema_registry` or 
   `registry_url` must be configured.
 * **messaging**: An `AvroTurf::Messaging` object to be shared by all generated models.
-  The `build_messaging!` method may be used to create a `Messaging` instance based
-  on the other configuration values.
+  The `build_messaging!` method may be used to create a `Avromatic::Messaging`
+  instance based on the other configuration values.
 * **logger**: The logger to use for the schema registry client.
 * [Custom Types](#custom-types)
 
 Example using a schema registry:
 
@@ -71,9 +71,18 @@
   config.schema_store = AvroTurf::SchemaStore.new(path: 'avro/schemas')
   config.registry_url = Rails.configuration.x.avro_schema_registry_url
   config.build_messaging!
 end
 ```
+
+#### Decoding
+
+* **use_custom_datum_reader**: `Avromatic` includes a modified subclass of
+  `Avro::IO::DatumReader`. This subclass returns additional information about
+  the index of union members when decoding Avro messages. This information is
+  used to optimize model creation when decoding. By default this information
+  is included in the hash returned by the `DatumReader` but can be omitted by
+  setting this option to `false`.
 
 ### Models
 
 Models are defined based on an Avro schema for a record.