diff --git a/bundles/systemd-timers/README.md b/bundles/systemd-timers/README.md
new file mode 100644
index 0000000..b82a606
--- /dev/null
+++ b/bundles/systemd-timers/README.md
@@ -0,0 +1,3 @@
+```
+systemctl is-active "$(systemctl cat zfs-mirror.timer | grep Unit= | cut -d= -f2)"
+```