diff --git a/bililive.observer/bililive.service b/bililive.observer/bililive.service
new file mode 100644
index 0000000..2e56985
--- /dev/null
+++ b/bililive.observer/bililive.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=BiliLive.Obs by frg2089
+
+[Service]
+# replace by urself
+User=$USER
+Type=simple
+ExecStart=/opt/obs-bililive/BiliLive.Service.linux-x64 --urls http://10.147.17.*:54321
+# same here.
+# just move `BiliLive.*` and `Microsoft.*` to /opt.
+# what's left are needed in runtime (working directory).
+WorkingDirectory=$HOME/.config/obs-bililive
+
+[Install]
+WantedBy=multi-user.target
diff --git a/readme.md b/readme.md
index 64a7778..41ee54c 100644
--- a/readme.md
+++ b/readme.md
@@ -6,7 +6,7 @@
   - Jellyfin 直接拉 Docker
     - 记得重新配 frp（
   - aria2 直接拉 Docker
-  - ~~OBS 直播插件（`frg2089/BiliLive.Observer`）后端，写个用户级 systemd service。~~
+  - OBS 直播插件（`frg2089/BiliLive.Observer`）后端
   - 剩下的真想不起来了=。=
 - Frameworks 应用中层：框架
   - Docker 懂的都懂。