public function add($owner, $repo, $number, array $assignees)
	{
		// Build the request path.
		$path = "/repos/$owner/$repo/issues/$number/assignees";

		$data = json_encode(
			array(
				'assignees' => $assignees,
			)
		);

		return $this->processResponse($this->client->post($this->fetchUrl($path), $data), 201);
	}