diff --git a/lib/lexdee/behaviour.ex b/lib/lexdee/behaviour.ex
index d476577..90f4ac1 100644
--- a/lib/lexdee/behaviour.ex
+++ b/lib/lexdee/behaviour.ex
@@ -1,5 +1,7 @@
 defmodule Lexdee.Behaviour do
   @callback get_state(struct, binary, Keyword.t()) :: {:ok, map} | {:error, any}
+  @callback delete_image(struct, binary, Keyword.t()) ::
+              {:ok, map} | {:error, any}
 
   @callback get_instance(struct, binary) :: {:ok, map} | {:error, any}
   @callback get_instance(struct, binary, Keyword.t()) ::
diff --git a/mix.exs b/mix.exs
index 7849e3d..deea5bb 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule Lexdee.MixProject do
   def project do
     [
       app: :lexdee,
-      version: "2.4.0",
+      version: "2.4.1",
       elixir: "~> 1.9",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,