diff --git a/lib/postgrex/extensions/multirange.ex b/lib/postgrex/extensions/multirange.ex
index f644c253..20031bd8 100644
--- a/lib/postgrex/extensions/multirange.ex
+++ b/lib/postgrex/extensions/multirange.ex
@@ -1,4 +1,6 @@
 defmodule Postgrex.Extensions.Multirange do
+  @moduledoc false
+
   import Postgrex.BinaryUtils, warn: false
 
   @behaviour Postgrex.SuperExtension