public function postComment($key, $comment)
	{
		$token = $this->oauth->getToken();

		// Set parameters.
		$parameters = array(
			'oauth_token' => $token['key'],
		);

		// Set the success response code.
		$this->oauth->setOption('success_code', 201);

		// Set the API base
		$base = '/v1/people/~/network/updates/key=' . $key . '/update-comments';

		// Build the xml.
		$xml = '<update-comment>
				  <comment>' . $comment . '</comment>
				</update-comment>';

		$header['Content-Type'] = 'text/xml';

		// Build the request path.
		$path = $this->getOption('api.url') . $base;

		// Send the request.
		$response = $this->oauth->oauthRequest($path, 'POST', $parameters, $xml, $header);

		return $response;
	}