Write SQL query to solve given problem: What are the special notes for the country whose average adolescent fertility rate is the highest?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT DISTINCT T1.SpecialNotes FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.CountryCode WHERE T2.Value = ( SELECT Value FROM Indicators WHERE IndicatorName LIKE 'Adolescent fertility rate%' ORDER BY Value DESC LIMIT 1 )