diff --git a/lib/consumer_offsets_consumer_group.ex b/lib/consumer_offsets_consumer_group.ex
index 003a9f8..c57f69c 100644
--- a/lib/consumer_offsets_consumer_group.ex
+++ b/lib/consumer_offsets_consumer_group.ex
@@ -1,4 +1,9 @@
 defmodule ConsumerOffsetsGenConsumer do
+
+  @moduledoc """
+  Genserver implementation to consume new messages on topic '__consumer_offsets'
+  """
+
   use KafkaEx.GenConsumer
 
   alias KafkaEx.Protocol.Fetch.Message
diff --git a/lib/kafkaex_lag_exporter.ex b/lib/kafkaex_lag_exporter.ex
index b2b2d6b..017ad7f 100644
--- a/lib/kafkaex_lag_exporter.ex
+++ b/lib/kafkaex_lag_exporter.ex
@@ -1,4 +1,9 @@
 defmodule KafkaexLagExporter do
+
+  @moduledoc """
+  Supervisor to start the '__consumer__offsets' watcher child
+  """
+
   use Application
 
   def start(_type, _args) do