+appropriate values for fake bare Git repositories.
+
+## CONFIG
+
+There are several ways to turn the various knobs on `vcsh`. In order of
+ascending precedence, they are:
+
+* `VARIABLE=foo vcsh`
+* </etc/vcsh/config>
+* <$XDG_CONFIG_HOME/vcsh/config>
+* `vcsh -c <file>`
+
+Please note that those files are sourced. Any and all commands will be
+executed in the context of your shell.
+
+Interesting knobs you can turn:
+
+* <$VCSH_GITATTRIBUTES>:
+ Can be <none>, or any other value.
+
+ <none> will not maintain Git attributes in a special location.
+
+ If set to any other value, repo-specific gitattributes files will be maintained.
+
+ Defaults to <none>.
+
+* <$VCSH_GITIGNORE>:
+ Can be <exact>, <none>, or <recursive>.
+
+ <exact> will seed the repo-specific ignore file with all file and directory
+ names which `git ls-files` returns.
+
+ <none> will not write any ignore file.
+
+ <recursive> will descend through all directories recursively additionally to
+ the above.
+
+ Defaults to <exact>.
+
+* <$VCSH_VCSH_WORKTREE>:
+ Can be <absolute>, or <relative>.
+
+ <absolute> will set an absolute path; defaulting to <$HOME>.
+
+ <relative> will set a path relative to <$GIT_DIR>.
+
+ Defaults to <absolute>.
+
+Less interesting knobs you could turn:
+
+* <$VCSH_DEBUG>:
+ Enter debug mode.
+
+* <$XDG_CONFIG_HOME>:
+ As specified in the 'XDG Base Directory Specification', see
+ <http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html>
+
+ Defaults to <$HOME/.config>.
+
+* <$VCSH_REPO_D>:
+ The directory where repositories are read from and stored.
+
+ Defaults to <$XDG_CONFIG_HOME/vcsh/repo.d>.
+
+* <$VCSH_HOOK_D>:
+ The directory where hooks are read from.
+
+ Defaults to <$XDG_CONFIG_HOME/vcsh/hooks-enabled>.
+
+* <$VCSH_BASE>:
+ The directory where repositories are checked out to.
+
+ Defaults to <$HOME>.
+