diff --git a/units/initrd-cleanup.service b/units/initrd-cleanup.service
index cfe7b4cb02..a18b2dd105 100644
--- a/units/initrd-cleanup.service
+++ b/units/initrd-cleanup.service
@@ -9,6 +9,7 @@
 
 [Unit]
 Description=Cleaning Up and Shutting Down Daemons
+Documentation=man:bootup(7)
 DefaultDependencies=no
 AssertPathExists=/etc/initrd-release
 OnFailure=emergency.target
diff --git a/units/initrd-parse-etc.service.in b/units/initrd-parse-etc.service.in
index 69a91d5b9a..651a8db16e 100644
--- a/units/initrd-parse-etc.service.in
+++ b/units/initrd-parse-etc.service.in
@@ -9,6 +9,7 @@
 
 [Unit]
 Description=Mountpoints Configured in the Real Root
+Documentation=man:bootup(7)
 AssertPathExists=/etc/initrd-release
 
 DefaultDependencies=no
diff --git a/units/initrd-switch-root.service b/units/initrd-switch-root.service
index f81b47871e..290ae72b61 100644
--- a/units/initrd-switch-root.service
+++ b/units/initrd-switch-root.service
@@ -9,6 +9,7 @@
 
 [Unit]
 Description=Switch Root
+Documentation=man:bootup(7)
 
 AssertPathExists=/etc/initrd-release
 
diff --git a/units/initrd-switch-root.target b/units/initrd-switch-root.target
index 1e32ec57dd..deb50145df 100644
--- a/units/initrd-switch-root.target
+++ b/units/initrd-switch-root.target
@@ -9,6 +9,7 @@
 
 [Unit]
 Description=Switch Root
+Documentation=man:bootup(7)
 AssertPathExists=/etc/initrd-release
 DefaultDependencies=no
 Wants=initrd-switch-root.service
diff --git a/units/initrd-udevadm-cleanup-db.service b/units/initrd-udevadm-cleanup-db.service
index b53d1f130a..f506c2299e 100644
--- a/units/initrd-udevadm-cleanup-db.service
+++ b/units/initrd-udevadm-cleanup-db.service
@@ -9,6 +9,7 @@
 
 [Unit]
 Description=Cleanup udev Database
+Documentation=man:bootup(7)
 DefaultDependencies=no
 AssertPathExists=/etc/initrd-release
 Conflicts=systemd-udevd.service systemd-udev-trigger.service systemd-udev-settle.service
diff --git a/units/kmod-static-nodes.service.in b/units/kmod-static-nodes.service.in
index ec8c5da910..a7cf4d3a87 100644
--- a/units/kmod-static-nodes.service.in
+++ b/units/kmod-static-nodes.service.in
@@ -9,6 +9,7 @@
 
 [Unit]
 Description=Create List of Static Device Nodes
+Documentation=man:kmod(8)
 DefaultDependencies=no
 Before=sysinit.target systemd-tmpfiles-setup-dev-early.service
 ConditionCapability=CAP_SYS_MODULE