Index: stable/11/lib/libc/sys/sendfile.2
===================================================================
--- stable/11/lib/libc/sys/sendfile.2
+++ stable/11/lib/libc/sys/sendfile.2
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 7, 2016
+.Dd January 25, 2019
 .Dt SENDFILE 2
 .Os
 .Sh NAME
@@ -104,7 +104,7 @@
 The least significant 16 bits of
 .Fa flags
 argument is a bitmap of these values:
-.Bl -tag -offset indent
+.Bl -tag -offset indent -width "SF_USER_READAHEAD"
 .It Dv SF_NODISKIO
 This flag causes
 .Nm
@@ -314,6 +314,12 @@
 .It Bq Er EIO
 An error occurred while reading from
 .Fa fd .
+.It Bq Er ENOTCAPABLE
+The
+.Fa fd
+or the
+.Fa s
+argument has insufficient rights.
 .It Bq Er ENOBUFS
 The system was unable to allocate an internal buffer.
 .It Bq Er ENOTCONN
@@ -375,3 +381,14 @@
 .Fx 11
 implementation was written by
 .An Gleb Smirnoff Aq Mt glebius@FreeBSD.org .
+.Sh BUGS
+The
+.Fn sendfile
+system call will not fail, i.e., return
+.Dv -1
+and set
+.Va errno
+to
+.Er EFAULT ,
+if provided an invalid address for
+.Fa sbytes .