Wrong parameter description for delete()

The docs API for the delete method says: ( http://www.couchbase.com/docs/couchbase-sdk-php-1.1/api-reference-update.html#table-couchbase-sdk_php_delete )

$object->delete($key [, $expiry ])

But the expire should actually be cas, as in the source https://github.com/couchbase/php-ext-couchbase/blob/master/couchbase.c#L401