diff --git a/man7/cgroups.7 b/man7/cgroups.7
index 109f7c089..12ebbd30d 100644
--- a/man7/cgroups.7
+++ b/man7/cgroups.7
@@ -208,6 +208,20 @@ mount \-t cgroup \-o all cgroup /sys/fs/cgroup
 .IR "\-o all" ,
 since it is the default if no controllers are explicitly specified.)
 
+It is not possible to mount the same controller
+against multiple cgroup hierarchies.
+For example, it is not possible to mount both the
+.I cpu
+and
+.I cpuacct
+controllers against one hierarchy, and to mount the
+.I cpu
+controller alone against another hierarchy.
+It is possible to create multiple mount points with exactly
+the same set of comounted controllers.
+However, in this case all that results is multiple mount points
+providing a view of the same hierarchy.
+
 Note that on many systems, the v1 controllers are automatically mounted under
 .IR /sys/fs/cgroup ;
 in particular,