diff --git a/source/includes/_pis.md b/source/includes/_pis.md
index eedc713..7d2de48 100644
--- a/source/includes/_pis.md
+++ b/source/includes/_pis.md
@@ -203,6 +203,7 @@ The table below outlines the currencies and supported payment rails, along with
 | USD                | `UK.MONZO.ABA`               | `UK.OBIE.BBAN`             | Account Number                 | -                                       | `UK.OBIE.NCC.US`         | ABA Routing Number           | Required               | -                                                                   |                                                                              |
 | USD                | `UK.MONZO.FEDWIRE`           | `UK.OBIE.BBAN`             | Account Number                 | -                                       | `UK.OBIE.NCC.US`         | Fedwire Routing Number       | Required               | -                                                                   |                                                                              |
 | USD                | `UK.OBIE.SWIFT`              | `UK.OBIE.BBAN`             | Account Number                 | -                                       | `UK.OBIE.BICFI`          | BIC                          | Required               | -                                                                   |                                                                              |
+| VND                | -                            | `UK.OBIE.BBAN`             | Account Number                 | -                                       | `UK.OBIE.BICFI`          | BIC                          | -                      | `Relationship` (required for `Business` or `BusinessSavingsAccount` recipients) |                                                                  |
 
 `CreditorAccount.Name` is required for all currencies.
 
@@ -243,6 +244,28 @@ For COP payments, `Initiation.SupplementaryData` must be a JSON object containin
 }
 ```
 
+For VND payments to a `Business` or `BusinessSavingsAccount` recipient, `Initiation.SupplementaryData` must be a JSON object containing a `Relationship` field describing the relationship between the payer and the recipient, for example:
+
+```json
+{
+  "Relationship": "COLLEAGUE"
+}
+```
+
+`Relationship` supports the following values:
+
+| Value                 | Description                    |
+|------------------------|---------------------------------|
+| `SELF`                 | Self                            |
+| `COLLEAGUE`            | Business partner                |
+| `CUSTOMER`             | Customer                        |
+| `BRANCH`               | Branch/Representative office     |
+| `SUBSIDIARY`           | Subsidiary                      |
+| `VENDOR`               | Supplier                        |
+| `CREDITOR`             | Creditor                        |
+| `DEBTOR`               | Debtor                          |
+| `OTHER_NOT_SPECIFIED`  | Other                           |
+
 <aside class="notice">
 If there are insufficient funds in the account, authorisation will fail and an error will be returned on redirection with the code `access_denied` and `error_description` being "Insufficient funds in selected account to make requested payment."
 </aside>