The B<-u> (I<user>) option causes B<sudo> to run the specified command
as a user other than I<root>. To specify a I<uid> instead of a
-I<username>, use I<#uid>.
+I<username>, use I<#uid>. Note that if the I<targetpw> Defaults
+option is set (see L<sudoers(@mansectform@)>) it is not possible
+to run commands with a uid not listed in the password database.
=item -v
If set, B<sudo> will prompt for the password of the user specified by
the B<-u> flag (defaults to C<root>) instead of the password of the
-invoking user. This flag is I<off> by default.
+invoking user. Note that this precludes the use of a uid not listed
+in the passwd database as an argument to the B<-u> flag.
+This flag is I<off> by default.
=item set_logname