diff --git a/config.ml b/config.ml
index 5707160..93e023d 100644
--- a/config.ml
+++ b/config.ml
@@ -7,45 +7,34 @@ type zone =
   | ZoneList of zone list
   | ZoneExclude of zone
 
-type addrs =
-  | ZoneName of string
-  | Ipv4 of V4.Prefix.t
-  | Ipv6 of V6.Prefix.t
+type addrs = ZoneName of string | Ipv4 of V4.Prefix.t | Ipv6 of V6.Prefix.t
 
 type l4_rule =
-  | TcpRule of { sport: int list; dport: int list }
-  | UdpRule of { sport: int list; dport: int list }
+  | TcpRule of { sport : int list; dport : int list }
+  | UdpRule of { sport : int list; dport : int list }
   | IcmpRule
 
-type rule = { src: addrs list; dest: addrs list; l4: l4_rule }
-
-type config = { zones: (string * zone) list; rules: rule list }
-
+type rule = { src : addrs list; dest : addrs list; l4 : l4_rule }
+type config = { zones : (string * zone list) list; rules : rule list }
 
 (* TODO *)
-let zone_of_json _ =
-  Zone "xxx"
+let zone_of_json _ = [ Zone "xxx" ]
 
 let addrs_of_json json =
   let open Yojson.Basic.Util in
   let value = json |> to_string in
   let addrs = ZoneName value in
-  let addrs = match V6.Prefix.of_string value with
-    | Ok p -> Ipv6 p
-    | Error _ -> addrs
+  let addrs =
+    match V6.Prefix.of_string value with Ok p -> Ipv6 p | Error _ -> addrs
   in
-  match V4.Prefix.of_string value with
-  | Ok p -> Ipv4 p
-  | Error _ -> addrs
+  match V4.Prefix.of_string value with Ok p -> Ipv4 p | Error _ -> addrs
 
 let addrs_list_of_json json =
   let open Yojson.Basic.Util in
   let elems = json |> to_list in
   List.map addrs_of_json elems
 
-let to_list_force = function
-  | `List l -> l
-  | _ -> []
+let to_list_force = function `List l -> l | _ -> []
 
 let to_int_list json =
   let open Yojson.Basic.Util in