Doesn‘t recognize yandex.ru as a source

There are a lot of visits from Yandex web search in HTTP logs, with HTTP referer like ‘http://yandex.ru/yandsearch?text=search+query’. However, all such visits are shown as Direct Entry in detailed visitor log. While visits from Yahoo are shown as 'Website: r.search.yahoo.comэю

Should Piwik recognize visits from Yandex and show queries?