diff --git a/man7/user_namespaces.7 b/man7/user_namespaces.7
index 36d3773d6..efb6d1c01 100644
--- a/man7/user_namespaces.7
+++ b/man7/user_namespaces.7
@@ -578,11 +578,13 @@ User namespaces require support in a range of subsystems across
 the kernel.
 When an unsupported subsystem is configured into the kernel,
 it is not possible to configure user namespaces support.
-As at Linux 3.8, most relevant subsystems support user namespaces,
-but there are a number of filesystems that do not.
-Linux 3.9 added user namespaces support for many of the remaining
-unsupported filesystems:
-Plan 9 (9P), Andrew File System (AFS), Ceph, CIFS, CODA, NFS, and OCFS2.
+
+As at Linux 3.8, most relevant subsystems supported user namespaces,
+but a number of filesystems did not have the infrastructure needed
+to map user and group IDs between user namespaces.
+Linux 3.9 added the required infrastructure support for many of
+the remaining unsupported filesystems
+(Plan 9 (9P), Andrew File System (AFS), Ceph, CIFS, CODA, NFS, and OCFS2).
 XFS support for user namespaces is not yet available.
 .\"
 .SH EXAMPLE