diff --git a/README.md b/README.md
index 243e2f4..eafb630 100644
--- a/README.md
+++ b/README.md
@@ -31,3 +31,90 @@ To make a user be an admin, the only way is via database.
 
 # Judge
 SYZOJ 2 uses a Docker-based sandboxed judger. Please go to [syzoj-judge](https://github.com/syzoj/syzoj-judge).
+
+# Advanced
+## System Service
+### Run SYZOJ 2
+Add SYZOJ 2 to system services.
+``` bash
+vim [syzoj2 path]/runsyzoj
+```
+Edit `runsyzoj` as as follows.
+``` bash
+#!/bin/bash
+cd [syzoj2 path]
+npm start > log.txt 2>&1
+```
+**Please change `[syzoj2 path]`.**
+### Run SYZOJ-JUDGE
+Add SYZOJ-JUDGE to system services.
+``` bash
+vim [syzoj-judge path]/runjudge
+```
+Edit `runjudge` as as follows.
+``` bash
+#!/bin/bash
+cd [syzoj-judge path]
+npm start > jlog.txt 2>&1
+```
+**Please change `[syzoj-judge path]`.**
+### Add To System Service
+``` bash
+vim /etc/systemd/system/syzoj.service
+```
+Edit `/etc/systemd/system/syzoj.service` as as follows.
+``` bash
+[Unit]
+Description=SYZOJ Online Judge
+After=network.target
+
+[Service]
+Type=simple
+PIDFile=/run/syzoj.pid
+WorkingDirectory=[syzoj2 path]
+ExecStart=[syzoj2 path]/runsyzoj
+StandardOutput=null
+StandardError=null
+
+[Install]
+WantedBy=multi-user.target
+```
+**Please change `[syzoj2 path]`.**
+
+``` bash
+vim /etc/systemd/system/syzoj-judge.service
+```
+Edit `/etc/systemd/system/syzoj-judge.service` as as follows.
+``` bash
+[Unit]
+Description=SYZOJ Judge Daemon
+After=network.target
+
+[Service]
+Type=simple
+PIDFile=/run/syzoj-judge.pid
+WorkingDirectory=[syzoj-judge path]
+ExecStart=[syzoj-judge path]/runjudge
+StandardOutput=null
+StandardError=null
+
+[Install]
+WantedBy=multi-user.target
+```
+**Please change `[syzoj-judge path]`.**
+### Usage
+#### Start
+``` bash
+systemctl start syzoj
+systemctl start syzoj-judge
+```
+#### Stop
+``` bash
+systemctl stop syzoj
+systemctl stop syzoj-judge
+```
+#### Restart
+``` bash
+systemctl restart syzoj
+systemctl restart syzoj-judge
+```
diff --git a/config-example.json b/config-example.json
index c3df2b3..5600eb3 100644
--- a/config-example.json
+++ b/config-example.json
@@ -85,6 +85,12 @@
       "version": "Lua 5.2.4",
       "editor": "lua"
     },
+    "luajit": {
+      "show": "LuaJIT",
+      "highlight": "lua",
+      "version": "LuaJIT 2.0.4",
+      "editor": "lua"
+    },
     "python2": {
       "show": "Python 2",
       "highlight": "python",