Re: [PATCH v6 7/8] update-ref: support multiple simultaneous updates

> diff --git a/Documentation/git-update-ref.txt b/Documentation/git-update-ref.txt
> index 0df13ff..0a0a551 100644
> --- a/Documentation/git-update-ref.txt
> +++ b/Documentation/git-update-ref.txt
> @@ -58,6 +58,58 @@ archive by creating a symlink tree).
> +option::
> +       Modify behavior of the next command naming a <ref>.
> +       The only valid option is `no-deref` to avoid dereferencing
> +       a symbolic ref.
> +
> +Use 40 "0" or the empty string to specify a zero value, except that

> +with `-z` an empty <oldvalue> is considered missing.
> +
> +If all <ref>s can be locked with matching <oldvalue>s
> +simultaneously, all modifications are performed.  Otherwise, no
> +modifications are performed.  Note that while each individual
> +<ref> is updated or deleted atomically, a concurrent reader may
> +still see a subset of the modifications.