diff --git a/docs/installation.md b/docs/installation.md
index 685e22f..7fecce6 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -131,6 +131,10 @@ particularly for those upgrading:
   Specifies the path to Moonraker's config file. The default location
   is `/home/<user>/moonraker.conf`.  When using this option to modify
   an existing installation it is necessary to add `-f` as well.
+- `-z`:
+  Disables `systemctl` commands during install (ie: daemon-reload, restart).
+  This is useful for installations that occur outside of a standard environment
+  where systemd is not running.
 
 When the script completes it should start both Moonraker and Klipper. In
 `/tmp/klippy.log` you should find the following entry: