diff --git a/man/bootup.xml b/man/bootup.xml
index 986996398c..b92c60f43a 100644
--- a/man/bootup.xml
+++ b/man/bootup.xml
@@ -179,6 +179,13 @@
identical to the system manager bootup (see above) until it
reaches basic.target. From there, systemd
approaches the special target initrd.target.
+
+ Before any file systems are mounted, it must be determined whether
+ the system will resume from hibernation or proceed with normal boot.
+ This is accomplished by systemd-hibernate-resume@.service
+ which must be finished before local-fs-pre.target,
+ so no filesystems can be mounted before the check is complete.
+
When the root device becomes available,
initd-root-device.target is reached.
If the root device can be mounted at