diff --git a/README.md b/README.md
index e0528dc0..aec33612 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,13 @@ TODO
 
 ## Services available
 
-- [x] PostgreSQL
+- [x] Apache Kafka
+- [x] Elasticsearch
 - [x] MySQL
+- [x] PostgreSQL
 - [x] Redis
 - [x] Redis Cluster
-- [x] Elasticsearch
+- [x] Zookeeper
 - [ ] ...
 
 ## A note on process working directory
diff --git a/nix/default.nix b/nix/default.nix
index 0103365c..122e3187 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -1,14 +1,15 @@
 { pkgs, lib, ... }:
 let
   inherit (import ./lib.nix) multiService;
-in {
+in
+{
   imports = builtins.map multiService [
     ./apache-kafka.nix
+    ./elasticsearch.nix
     ./mysql.nix
     ./postgres.nix
-    ./redis.nix
     ./redis-cluster.nix
-    ./elasticsearch.nix
+    ./redis.nix
     ./zookeeper.nix
   ];
 }
diff --git a/nix/lib.nix b/nix/lib.nix
index 45a4a4ed..ebf6bf06 100644
--- a/nix/lib.nix
+++ b/nix/lib.nix
@@ -5,14 +5,16 @@
   # 'name' parameter, and is expected to set the final process-compose config in
   # its `outputs.settings` option.
   multiService = mod:
-    { config, pkgs, lib, ... }: let
+    { config, pkgs, lib, ... }:
+    let
       # Derive name from filename
       name = lib.pipe mod [
         builtins.baseNameOf
         (lib.strings.splitString ".")
         builtins.head
       ];
-    in {
+    in
+    {
       options.services.${name} = lib.mkOption {
         description = ''
           ${name} service
diff --git a/nix/postgres.nix b/nix/postgres.nix
index 05a17d24..53829137 100644
--- a/nix/postgres.nix
+++ b/nix/postgres.nix
@@ -344,7 +344,7 @@ in
                 initdbArgs =
                   config.initdbArgs
                   ++ (lib.optionals (config.superuser != null) [ "-U" config.superuser ])
-                  ++ ["-D" config.dataDir ];
+                  ++ [ "-D" config.dataDir ];
 
                 setupScript = pkgs.writeShellScriptBin "setup-postgres" ''
                   set -euo pipefail