diff --git a/man7/cgroups.7 b/man7/cgroups.7
index 892b591da..279060919 100644
--- a/man7/cgroups.7
+++ b/man7/cgroups.7
@@ -130,6 +130,23 @@ that are supported under version 2,
 while also using version 1 controllers
 where version 2 does not yet support those controllers.
 .\"
+.SS Tasks versus processes
+In cgroups v1, a distinction is drawn between
+.I processes
+and
+.IR tasks .
+In this view, a process can consist of multiple tasks
+(more commonly called threads, from a user-space perspective).
+In cgroups v1, it is possible independently manipulate
+the cgroup memberships of the tasks in a process.
+Because this ability caused certain problems,
+.\" FIXME Add some text describing why this was a problem.
+the ability to independently manipulate the cgroup memberships
+of the tasks in a process has been removed in cgroups v2.
+Cgroups v2 allows manipulation of cgroup membership only for processes
+(which has the effect of changing the cgroup membership of
+all tasks in the process).
+.\"
 .SS Mounting
 To be available, a given cgroup subsystem must be compiled into the
 kernel.