Documentation/config/filter.txt

   1 filter.<driver>.clean::
   2         The command which is used to convert the content of a worktree
   3         file to a blob upon checkin.  See linkgit:gitattributes[5] for
   4         details.
   5
   6 filter.<driver>.smudge::
   7         The command which is used to convert the content of a blob
   8         object to a worktree file upon checkout.  See
   9         linkgit:gitattributes[5] for details.