-*** Gnus is now a MIME-capable reader. This affects many parts of
-Gnus, and adds a slew of new commands. See the manual for details.
+It is enabled by default (see `password-cache'), with a short timeout
+of 16 seconds (see `password-cache-expiry'). If PGG is used as the
+PGP backend, the PGP passphrase is managed by this mechanism.
+Passwords for ManageSieve connections are managed by this mechanism,
+after quering the user about whether to do so.