This option is only valid for the update command.
	Don't fetch new objects from the remote site.

--checkout::
	This option is only valid for the update command.
	Checkout the commit recorded in the superproject on a detached HEAD
	in the submodule. This is the default behavior, the main use of
	this option is to override `submodule.$name.update` when set to
	a value other than `checkout`.
	If the key `submodule.$name.update` is either not explicitly set or
	set to `checkout`, this option is implicit.

--merge::
	This option is only valid for the update command.
	Merge the commit recorded in the superproject into the current branch
	of the submodule. If this option is given, the submodule's HEAD will
	not be detached. If a merge failure prevents this process, you will
	have to resolve the resulting conflicts within the submodule with the
	usual conflict resolution tools.
	If the key `submodule.$name.update` is set to `merge`, this option is
	implicit.

--rebase::
	This option is only valid for the update command.
	Rebase the current branch onto the commit recorded in the
	superproject. If this option is given, the submodule's HEAD will not
	be detached. If a merge failure prevents this process, you will have
	to resolve these failures with linkgit:git-rebase[1].
	If the key `submodule.$name.update` is set to `rebase`, this option is
	implicit.

--init::
	This option is only valid for the update command.
	Initialize all submodules for which "git submodule init" has not been
	called so far before updating.

--name::
	This option is only valid for the add command. It sets the submodule's
	name to the given string instead of defaulting to its path. The name
	must be valid as a directory name and may not end with a '/'.

--reference <repository>::
	This option is only valid for add and update commands.  These
	commands sometimes need to clone a remote repository. In this case,
	this option will be passed to the linkgit:git-clone[1] command.
+
*NOTE*: Do *not* use this option unless you have read the