diff --git a/lib/eredis_sub/handler.ex b/lib/eredis_sub/handler.ex
new file mode 100644
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+++ b/lib/eredis_sub/handler.ex
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+defmodule EredisSub.Handler do
+  @moduledoc """
+  Behaviour for handling messages received from Redis.
+  """
+
+  @doc """
+  Handles a message received from Redis.
+  Receives a binary message and a metadata that can be customized upon subscription.
+  Return value is ignored.
+  """
+  @callback handle(binary, term) :: term
+end