diff --git a/README.md b/README.md
index 0570038..a0d4416 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,13 @@
 # certrenew.service
 A sample to configure certbot auto renew with systemd
 
-## Reference
+## Download
+```sh
+# assuming you have `wget` installed
+wget -qO- l.sup39.dev/certrenew | sh -
+```
+
+## References
 - [crontabを捨てsystemdに定期実行を任せよう。(narikei)](https://qiita.com/narikei/items/ca4823c7f6790f0cbe0b)
 - [systemd .timerについて調べた事を記事にしておく(SOUICHIROU)](https://www.souichi.club/raspberrypi/systemd-timer/#OnCalendar)
 - [How do I reload a group of systemd services?](https://unix.stackexchange.com/questions/334471/how-do-i-reload-a-group-of-systemd-services)
diff --git a/setup.sh b/setup.sh
new file mode 100644
index 0000000..08f3ebf
--- /dev/null
+++ b/setup.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+baseURL=https://raw.githubusercontent.com/sup39/certrenew.service/master
+dst=/etc/systemd/system
+if [ ! -w "$dst" ]; then
+  echo "$dst is not writable. Download to /tmp instead"
+  dst=/tmp
+fi
+wget -P "$dst" "$baseURL/certrenew.service" "$baseURL/certrenew.timer" "$baseURL/certrenew.target" "$baseURL/certrenew.path"
+cat <<EOF
+Next step:
+(1) edit $dst/certrenew.service
+(2) $ sudo systemctl enable certrenew.service certrenew.timer certrenew.path
+(3) $ sudo systemctl start certrenew.service certrenew.timer certrenew.target certrenew.path
+EOF