diff --git a/contrib/systemd/btrbk.service.in b/contrib/systemd/btrbk.service.in
index bc8b769..0f36f41 100644
--- a/contrib/systemd/btrbk.service.in
+++ b/contrib/systemd/btrbk.service.in
@@ -1,5 +1,6 @@
 [Unit]
 Description=btrbk backup
+Documentation=man:btrbk(1)
 
 [Service]
 Type=oneshot