README.md in logstash-codec-protobuf-1.1.0 vs README.md in logstash-codec-protobuf-1.2.0

@@ -25,10 +25,13 @@
 
 	kafka 
 	{
 	  zk_connect => "127.0.0.1"
 	  topic_id => "unicorns_protobuffed"
+	  key_deserializer_class => "org.apache.kafka.common.serialization.ByteArrayDeserializer"
+	  value_deserializer_class => "org.apache.kafka.common.serialization.ByteArrayDeserializer"
+
 	  codec => protobuf 
 	  {
 	    class_name => "Animals::Unicorn"
 	    include_path => ['/path/to/pb_definitions/Animal.pb.rb', '/path/to/pb_definitions/Unicorn.pb.rb']
 	  }
@@ -38,16 +41,26 @@
 
 	kafka 
 	{
 	  zk_connect => "127.0.0.1"
 	  topic_id => "unicorns_protobuffed"
+	  key_deserializer_class => "org.apache.kafka.common.serialization.ByteArrayDeserializer"
+	  value_deserializer_class => "org.apache.kafka.common.serialization.ByteArrayDeserializer"
 	  codec => protobuf 
 	  {
-      class_name => "Animals.Unicorn"
+	    class_name => "Animals.Unicorn"
 	    include_path => ['/path/to/pb_definitions/Animal_pb.rb', '/path/to/pb_definitions/Unicorn_pb.rb']
 	    protobuf_version => 3
 	  }
-	}	 
+	}
+
+For version 3 class names check the bottom of the generated protobuf ruby file. It contains lines like this:
+
+    Animals.Unicorn = Google::Protobuf::DescriptorPool.generated_pool.lookup("Animals.Unicorn").msgclass
+
+Use the parameter for the lookup call as the class_name for the codec config.
+
+If you're using a kafka input please also set the deserializer classes as shown above.
 
 ### Class loading order
 
 Imagine you have the following protobuf version 2 relationship: class Unicorn lives in namespace Animal::Horse and uses another class Wings.