What happened to SSL_CIPHERS?

Folks,

This doc says we ought to have the ssl_ciphers parameter:

http://www.postgresql.org/docs/9.0/static/runtime-config-connection.html#RUNTIME-CONFIG-CONNECTION-SECURITY

Nor is there anything in the 9.0 release notes about it going away.

Yet:

postgres=# select version();
                                                  version

---------------------------------------------------------------------------------------------------------
  PostgreSQL 9.0.1 on x86_64-unknown-linux-gnu, compiled by GCC gcc
(Ubuntu 4.3.3-5ubuntu4) 4.3.3, 64-bit
(1 row)

postgres=# show ssl_ciphers;
ERROR:  unrecognized configuration parameter "ssl_ciphers"

So, did ssl_ciphers go away on purpose?  If so, why?  If not, why isn't
it accessible?

--
                                   -- Josh Berkus
                                      PostgreSQL Experts Inc.
                                      http://www.pgexperts.com