--ff-only::
Refuse to merge and exit with a non-zero status unless the
- current `HEAD` is already up-to-date or the merge can be
+ current `HEAD` is already up to date or the merge can be
resolved as a fast-forward.
+-S[<keyid>]::
+--gpg-sign[=<keyid>]::
+ GPG-sign the resulting merge commit. The `keyid` argument is
+ optional and defaults to the committer identity; if specified,
+ it must be stuck to the option without a space.
+
--log[=<n>]::
--no-log::
In addition to branch names, populate the log message with