-$a->config['piwik']['baseurl'] = 'example.com/piwik/';
-$a->config['piwik']['sideid'] = '1';
-$a->config['piwik']['optout'] = true;
+You have to add 4 more configuration variables for the addon:
+
+ $a->config['piwik']['baseurl'] = 'example.com/piwik/';
+ $a->config['piwik']['sideid'] = '1';
+ $a->config['piwik']['optout'] = true;
+ $a->config['piwik']['async'] = false;