diff --git a/sbin/mount_nfs/mount_nfs.8 b/sbin/mount_nfs/mount_nfs.8
--- a/sbin/mount_nfs/mount_nfs.8
+++ b/sbin/mount_nfs/mount_nfs.8
@@ -28,7 +28,7 @@
 .\"	@(#)mount_nfs.8	8.3 (Berkeley) 3/29/95
 .\" $FreeBSD$
 .\"
-.Dd April 3, 2023
+.Dd June 14, 2023
 .Dt MOUNT_NFS 8
 .Os
 .Sh NAME
@@ -231,6 +231,9 @@
 This option requires the
 .Cm nfsv4
 option.
+Note that for NFS servers such as AmazonEFS, where each new TCP
+connection can connect to a different cluster that maintains lock
+state separately, this option cannot be used.
 .It Cm nfsv2
 Use the NFS Version 2 protocol (the default is to try version 3 first
 then version 2).