hg pull, - number of changesets?

[Marc Singer]

     elf at florence ~...embedded/linux-2.6 > hg pull
     pulling from http://www.kernel.org/hg/
     searching for changes
     adding changesets
     adding manifests
     adding file revisions
     modified 1059 files, added 12 changesets and -20048 new revisions
     (run 'hg update' to get a working copy)

-20048 new revisions.  Really?