diff --git a/src/main/java/seedu/address/model/person/MeetingTime.java b/src/main/java/seedu/address/model/person/MeetingTime.java
index 5857861d9c6..2ccb8f8724d 100644
--- a/src/main/java/seedu/address/model/person/MeetingTime.java
+++ b/src/main/java/seedu/address/model/person/MeetingTime.java
@@ -13,7 +13,8 @@ public class MeetingTime {
 
     // Replace uuuu in format to yyyy to not confuse users
     public static final String MESSAGE_CONSTRAINTS = "Meeting time should be in the format of "
-            + DATE_TIME_FORMAT.replace("u", "y");
+            + DATE_TIME_FORMAT.replace("u", "y")
+            + " and have a valid date and time";
 
     public final LocalDateTime value;