why sudo asking for root password?

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http://forums.opensuse.org – I just installed 11.3 32b, added myself to the sudoers files, but when I sudo it asks me for root password and not my password, what am I doing wrong? I remember when setting my password during installation I unselected something like "use this password for system administration". shalom@shalom-laptop:~> sudo zypper up root's password: (Distributions)