diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
index cabf718922..7806d86398 100644
--- a/cmd/zfs/zfs_main.c
+++ b/cmd/zfs/zfs_main.c
@@ -317,7 +317,7 @@ get_usage(zfs_help_t idx)
 	case HELP_SEND:
 		return (gettext("\tsend [-DnPpRvLecwhb] [-[i|I] snapshot] "
 		    "<snapshot>\n"
-		    "\tsend [-nvPLecw] [-i snapshot|bookmark] "
+		    "\tsend [-DnvPLecw] [-i snapshot|bookmark] "
 		    "<filesystem|volume|snapshot>\n"
 		    "\tsend [-DnPpvLec] [-i bookmark|snapshot] "
 		    "--redact <bookmark> <snapshot>\n"
diff --git a/man/man8/zfs-send.8 b/man/man8/zfs-send.8
index a3d08fbf6e..688bd03397 100644
--- a/man/man8/zfs-send.8
+++ b/man/man8/zfs-send.8
@@ -44,7 +44,7 @@
 .Ar snapshot
 .Nm zfs
 .Cm send
-.Op Fl DLPRcenpsvw
+.Op Fl DLPcensvw
 .Op Fl i Ar snapshot Ns | Ns Ar bookmark
 .Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot
 .Nm zfs
@@ -285,7 +285,7 @@ You will be able to receive your streams on future versions of ZFS.
 .It Xo
 .Nm zfs
 .Cm send
-.Op Fl DLPRcenpvw
+.Op Fl DLPcenvw
 .Op Fl i Ar snapshot Ns | Ns Ar bookmark
 .Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot
 .Xc
@@ -296,7 +296,11 @@ filesystem must not be mounted.
 When the stream generated from a filesystem or volume is received, the default
 snapshot name will be
 .Qq --head-- .
-.Bl -tag -width "-L"
+.Bl -tag -width "-D"
+.It Fl D , -dedup
+Deduplicated send is no longer supported.
+This flag is accepted for backwards compatibility, but a regular,
+non-deduplicated stream will be generated.
 .It Fl L , -large-block
 Generate a stream which may contain blocks larger than 128KB.
 This flag has no effect if the