Automatic package is installed, but aptitude doesn't find any rdependencies. What am I doing wrong?

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http://unix.stackexchange.com – I have a package lm-sensors automatically installed on my Ubuntu 10.04, but can't find packages, that depend on it: $ aptitude show lm-sensors Package: lm-sensors New: yes State: installed Automatically installed: yes Version: 1:3.1.2-2 Priority: extra Section: utils Maintainer: Ubuntu Developers <[email protected]> Uncompressed Size: 455k Depends: sed (>= 4.0.5-1), lsb-base (>= 3.2-13), libc6 (>= 2.3.4), libsensors4 (>= 1:3.1.1), perl Recommends: fancontrol Suggests: sensord, read-edid, i2c-tools Description: utilities to read temperature/voltage/fa (HowTos)