diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index 8631274e421..36c6ca5639d 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -171,8 +171,8 @@ The following table gives an overview of what each parameter used in the Feature
 | Parameter         | Description                                                                                           | Valid Parameter Input                                                                                                                       |
 |-------------------|-------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------|
 | NAME              | The full name of the doctor/patient                                                                   | Only accepts alphanumeric characters and spaces                                                                                             |
-| NRIC              | The National Registration Identity Card number or Foreign Identification Number of the doctor/patient | Starts with S/T/F/G/M and followed by 7 digits and ends with an alphabet                                                                    |
-| PHONE_NUMBER      | The phone number of the doctor/patient                                                                | Only contain numbers, and it should be at least 3 digits long.                                                                              |
+| NRIC              | The National Registration Identity Card number or Foreign Identification Number of the doctor/patient | Starts with S/T/F/G/M and followed by 7 digits and ends with an alphabet. The first and last letter can either be upper or lowercase        |
+| PHONE_NUMBER      | The phone number of the doctor/patient                                                                | Only contain numbers, and it should be at least 3 digits long                                                                               |
 | INDEX             | The position of the appointment/doctor/patient in the filtered list                                   | Must be a positive integer (1, 2, 3, ...) and should not be larger than the length of the list and have a maximum possible value of MAX_INT |
 | MEDICAL_CONDITION | The medical condition of the patient                                                                  | Only accepts alphanumeric characters without any spaces                                                                                     |
 | SPECIALISATION    | The specialisation of the doctor                                                                      | Only accepts alphanumeric characters without any spaces                                                                                     |