Show brief help for an `notmuch git` command.
-.. option:: init
+.. option:: init [--format-version=N]
Create an empty `notmuch git` repository.
This wraps 'git init' with a few extra steps to support subsequent
status and commit commands.
+ .. describe:: --format-version=N
+
+ Create a repo in format version N. By default :any:`notmuch-git`
+ uses the highest supported version, which is the best choice for
+ most use-cases.
+
.. option:: log [arg ...]
A wrapper for 'git log'.