Add mod_opt_type/1 callback to gen_mod behaviour

diff --git a/src/gen_mod.erl b/src/gen_mod.erl
index 8a432b4fcc41ec1d2cdda95839d75b8ecca1f2b8..f96397192eecd0830675bfe6adc3727ad8f63085 100644 (file)
--- 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]).