diff --git a/man7/cgroups.7 b/man7/cgroups.7
index 9e41cccb9..bf5970a10 100644
--- a/man7/cgroups.7
+++ b/man7/cgroups.7
@@ -532,6 +532,14 @@ A cgroup v2 controller is available only if it is not currently in use
 via a mount against a cgroup v1 hierarchy.
 Or, to put things another way, it is not possible to employ
 the same controller against both a v1 hierarchy and the unified v2 hierarchy.
+.PP
+Note that on many modern systems,
+.BR systemd (1)
+automatically mounts the
+.I cgroup2
+filesystem at
+.I /sys/fs/cgroup/unified
+during the boot process.
 .\"
 .SS Cgroups v2 controllers
 The following controllers, documented in the kernel source file