diff --git a/man7/cgroups.7 b/man7/cgroups.7
index a79304d15..90a8fb01e 100644
--- a/man7/cgroups.7
+++ b/man7/cgroups.7
@@ -155,9 +155,13 @@ must be mounted before they can be controlled.
 The usual place for this is under
 .IR /sys/fs/cgroup .
 If all the desired subsystems can be comounted,
-then the system may simply
+then can do so with the following command:
 
-    mount -t cgroup cgroup /sys/fs/cgroup
+    mount -t cgroup -o all cgroup /sys/fs/cgroup
+
+(One can achieve the same result by omitting
+.IR "-o all" ,
+since it is the default if subsystems are explicitly specified.)
 
 If multiple, separately mounted subsystems are desired, then this is
 usually done in per-subsystem subdirectories.