public function create($issueId, array $params = [])
    {
        $defaults = [
            'relation_type' => 'relates',
            'issue_to_id' => null,
            'delay' => null,
        ];

        $params = $this->sanitizeParams($defaults, $params);

        $params = json_encode(['relation' => $params]);

        return json_decode($this->post('/issues/'.urlencode($issueId).'/relations.json', $params), true);
    }