diff --git a/Upgrade.md b/Upgrade.md
index 6e5d67d..26358ce 100644
--- a/Upgrade.md
+++ b/Upgrade.md
@@ -15,4 +15,29 @@ ALTER TABLE SmartlockAuth ADD COLUMN `allowedUntilDate` DATETIME NOT NULL AFTER
 ALTER TABLE SmartlockAuth ADD COLUMN `allowedUntilTime` SMALLINT AFTER `allowedUntilDate`;
 ALTER TABLE SmartlockAuth ADD COLUMN `allowedWeekDays` SMALLINT NOT NULL AFTER `allowedUntilTime`;
 
+DROP FUNCTION IF EXISTS DaysFromBitMask;
+@delimiter ++;
+CREATE FUNCTION DaysFromBitMask (val INT)
+RETURNS VARCHAR(255) DETERMINISTIC
+BEGIN
+    DECLARE DAY_RESULT VARCHAR(255);
+    SET DAY_RESULT="";
+    IF val =  0  THEN SET DAY_RESULT='Keine'; END IF;
+    IF val >= 64 THEN SET DAY_RESULT='Mo'; SET val=val-64; END IF;
+    IF val >= 32 THEN SET DAY_RESULT=CONCAT('Di',', ',DAY_RESULT); SET val=val-32; END IF;
+    IF val >= 16 THEN SET DAY_RESULT=CONCAT('Mi',', ',DAY_RESULT); SET val=val-16; END IF;
+    IF val >= 8  THEN SET DAY_RESULT=CONCAT('Do',', ',DAY_RESULT); SET val=val-8;  END IF;
+    IF val >= 4  THEN SET DAY_RESULT=CONCAT('Fr',', ',DAY_RESULT); SET val=val-4;  END IF;
+    IF val >= 2  THEN SET DAY_RESULT=CONCAT('Sa',', ',DAY_RESULT); SET val=val-2;  END IF;
+    IF val >= 1  THEN SET DAY_RESULT=CONCAT('So',', ',DAY_RESULT); SET val=val-1;  END IF;
+    /*Wenn val nicht mit "Keine" oder mit "Mo" endet, dann das Komma+Leerzeichen abschneiden*/
+    SET DAY_RESULT = CASE WHEN DAY_RESULT LIKE '%, ' THEN LEFT(DAY_RESULT,length(DAY_RESULT)-2)  ELSE DAY_RESULT END;
+    RETURN DAY_RESULT;
+END
+++
+@delimiter ;++
+GRANT EXECUTE ON FUNCTION DaysFromBitMask TO nuki;
+/*Test the function with some int values*/
+SELECT DaysFromBitMask(54);
+
 ```
\ No newline at end of file