I was planning to view manual page for 'ip' command for usage on 'ip tuntap'. To my surprise, there was no 'tuntap' pattern in that manual page. However 'ip tuntap' is well-supported when I try to use that command.
So I guess that my local manual page for 'ip' is outdate and need to be upgraded. I know that some manual pages can be installed by 'apt-get install XXX-doc'. But how can I upgrade the manual for 'ip'?