doc/hgrc.5.txt

6209:4e8cd15240bf

  Otherwise, give a name that you choose, followed by "=", followed by
  the path to the ".py" file (including the file name extension) that
  defines the extension.

  To explicitly disable an extension that is enabled in an hgrc of
  broader scope, prepend its path with '!', as in 
  'hgext.foo = !/ext/path' or 'hgext.foo = !' when no path is supplied.

  Example for ~/.hgrc:

    [extensions]

6210:942287cb1f57

  Otherwise, give a name that you choose, followed by "=", followed by
  the path to the ".py" file (including the file name extension) that
  defines the extension.

  To explicitly disable an extension that is enabled in an hgrc of
  broader scope, prepend its path with '!', as in
  'hgext.foo = !/ext/path' or 'hgext.foo = !' when no path is supplied.

  Example for ~/.hgrc:

    [extensions]