Package: gnus
Version: 5.110018
No Gnus v0.18
GNU Emacs 23.3.1 (x86_64-apple-darwin, NS apple-appkit-1038.35)
 of 2011-03-09 on black.porkrind.org
200 news.gmane.org InterNetNews NNRP server INN 2.5.1 ready (posting ok)
101 Capability list:
VERSION 2
IMPLEMENTATION INN 2.5.1
AUTHINFO USER
HDR
LIST ACTIVE ACTIVE.TIMES DISTRIB.PATS HEADERS NEWSGROUPS OVERVIEW.FMT
OVER
POST
READER
STARTTLS
.

[[info:gnus#Agent Expiry]] sez:

    ,----
    |    Note that other functions, e.g. `gnus-request-expire-articles',
    | might run `gnus-agent-expire' for you to keep the agent synchronized
    | with the group.
    `----

but there's no documentation on gnus-request-expire-articles that I can
find.  IMO It either should be documented as a user-facing-function or,
if it's an implementation detail, not mentioned in the documentation.