Why are the man pages for gvfs-commands not in Ubuntu?

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http://askubuntu.com – These are the man pages for gvfs-cat gvfs-less gvfs-monitor-dir gvfs-move gvfs-rm gvfs-trash gvfs-copy gvfs-ls gvfs-monitor-file gvfs-open gvfs-save gvfs-tree gvfs-info gvfs-mkdir gvfs-mount gvfs-rename gvfs-set-attribute http://www.unix.com/man-pages.php?query=gvfs-info&apropos=0&section=1&os... Every year I see that there are more commands without manpage nor apropose description, nothing! Is that the path? (HowTos)