public function addComment($issue_key, $params)
	{
		if ( is_string($params) ) {
			// If $params is scalar string value -> wrapping it properly.
			$params = array(
				'body' => $params,
			);
		}

		return $this->api(self::REQUEST_POST, sprintf('/rest/api/2/issue/%s/comment', $issue_key), $params);
	}