diff --git a/contrib/systemd/offlineimap-oneshot.service b/contrib/systemd/offlineimap-oneshot.service
index 480ed6e..97cfafb 100644
--- a/contrib/systemd/offlineimap-oneshot.service
+++ b/contrib/systemd/offlineimap-oneshot.service
@@ -1,5 +1,6 @@
 [Unit]
 Description=Offlineimap Service (oneshot)
+Documentation=man:offlineimap(1)
 
 [Service]
 Type=oneshot
diff --git a/contrib/systemd/offlineimap-oneshot@.service b/contrib/systemd/offlineimap-oneshot@.service
index 57a370a..c096282 100644
--- a/contrib/systemd/offlineimap-oneshot@.service
+++ b/contrib/systemd/offlineimap-oneshot@.service
@@ -1,5 +1,6 @@
 [Unit]
 Description=Offlineimap Service for account %i (oneshot)
+Documentation=man:offlineimap(1)
 
 [Service]
 Type=oneshot
diff --git a/contrib/systemd/offlineimap.service b/contrib/systemd/offlineimap.service
index 9d419d8..a574c42 100644
--- a/contrib/systemd/offlineimap.service
+++ b/contrib/systemd/offlineimap.service
@@ -1,5 +1,6 @@
 [Unit]
 Description=Offlineimap Service
+Documentation=man:offlineimap(1)
 
 [Service]
 ExecStart=/usr/bin/offlineimap -u syslog
diff --git a/contrib/systemd/offlineimap@.service b/contrib/systemd/offlineimap@.service
index 28ef332..ad3ec5a 100644
--- a/contrib/systemd/offlineimap@.service
+++ b/contrib/systemd/offlineimap@.service
@@ -1,5 +1,6 @@
 [Unit]
 Description=Offlineimap Service for account %i
+Documentation=man:offlineimap(1)
 
 [Service]
 ExecStart=/usr/bin/offlineimap -a %i -u syslog