Change VAT Number to NRIC Number

Hye,
I want to change the VAT Number Column to NRIC Number (Required)
I found the layout in: components/com_solidres/layouts/asset/guestform.php but not sure about changing the label name from "VAT Number (Optional)" to "NRIC".

Also, I put "required" in the code.
Is it correct?

<div class="form-group">
<label for="vat_number">
<?php echo JText::_("SR_VAT_NUMBER") ?>
</label>
<input id="vat_number"
required
name="jform[customer_vat_number]"
type="text"
class="form-control input-block-level"
value="<?php echo (isset($displayData->guest["customer_vat_number"]) ? $displayData->guest["customer_vat_number"] : "") ?>"/>
</div>