missing documentation of option "safe-upgrade"

[Marc Schoechlin]

Package: aptitude
Version: 0.4.6.1-1ubuntu3
Severity: important

After the upgrade to gutsy apt reports the following warning-message:
----
# aptitude upgrade
W: The "upgrade" command is deprecated; use "safe-upgrade" instead.
....
----
The manpage does not provide any information about the option "safe-upgrade".


-- System Information:
Debian Release: lenny/sid
  APT prefers gutsy-updates
  APT policy: (500, 'gutsy-updates'), (500, 'gutsy-security'), (500, 'gutsy-proposed'), (500, 'gutsy')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-14-386
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages aptitude depends on:
ii  apt [libapt-pkg-li 0.7.6ubuntu14         Advanced front-end for dpkg
ii  libc6              2.6.1-1ubuntu9        GNU C Library: Shared libraries
ii  libgcc1            1:4.2.1-5ubuntu4      GCC support library
ii  libncursesw5       5.6+20070716-1ubuntu3 Shared libraries for terminal hand
ii  libsigc++-2.0-0c2a 2.0.17-2ubuntu2       type-safe Signal Framework for C++
ii  libstdc++6         4.2.1-5ubuntu4        The GNU Standard C++ Library v3

Versions of packages aptitude recommends:
ii  aptitude-doc-en [aptitu 0.4.6.1-1ubuntu3 English manual for aptitude, a ter
ii  libparse-debianchangelo 1.0-1            parse Debian changelogs and output

-- no debconf information