diff --git a/README.md b/README.md
index 6163704..add23b3 100644
--- a/README.md
+++ b/README.md
@@ -133,9 +133,9 @@ CREATE TABLE IF NOT EXISTS SmartlockAuth
         (
         `accountUserId` VARCHAR(24),
         `allowedFromDate` DATETIME NOT NULL,
-        `allowedFromTime` SMALLINT NOT NULL,
+        `allowedFromTime` SMALLINT,
         `allowedUntilDate` DATETIME NOT NULL,
-        `allowedUntilTime` SMALLINT NOT NULL,
+        `allowedUntilTime` SMALLINT,
         `allowedWeekDays` SMALLINT NOT NULL,
         `authId` VARCHAR(24), /*it may be shorter -> 3 digits*/
         `creationDate` DATETIME NOT NULL,