From d54f2115145957a8a486f15b396eb84d24846e86 Mon Sep 17 00:00:00 2001
From: Holger Weiss <holger@zedat.fu-berlin.de>
Date: Sun, 1 May 2016 22:09:40 +0200
Subject: [PATCH] Add mod_opt_type/1 callback to gen_mod behaviour

---
 src/gen_mod.erl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gen_mod.erl b/src/gen_mod.erl
index 8a432b4fc..f96397192 100644
--- a/src/gen_mod.erl
+++ b/src/gen_mod.erl
@@ -52,6 +52,7 @@
 
 -callback start(binary(), opts()) -> any().
 -callback stop(binary()) -> any().
+-callback mod_opt_type(atom()) -> fun((term()) -> term()) | [atom()].
 
 -export_type([opts/0]).
 -export_type([db_type/0]).