How come /sbin/nologin is in /etc/shells contradicting the man page?

[Daniel J Walsh]

SHELLS(5) Linux Programmer’s Manual SHELLS(5)

NAME
shells - pathnames of valid login shells

DESCRIPTION
/etc/shells is a text file which contains the full pathnames of valid
login shells. This file is consulted by chsh(1) and available to be
queried by other programs.

Be aware that there are programs which consult this file to find out if
a user is a normal user. E.g.: ftp daemons traditionally disallow
access to users with shells not included in this file.

EXAMPLE
/etc/shells may contain the following paths:

/bin/sh
/bin/csh

FILES
/etc/shells



 > grep ftp /etc/shells
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin

This has led us to hack up the genhomedircon script to remove this from 
valid shells.