diff --git a/README.md b/README.md
index 1a5d430..2488b75 100644
--- a/README.md
+++ b/README.md
@@ -33,17 +33,17 @@ puts code.to_ansi
 
 Codes can be generated with the following attributes:
 
-| Attribute            | Description                    | required           | max size |
-|----------------------|--------------------------------|--------------------|----------|
-| `bic`                | Bank Identifier Code           |                    | 11       |
-| `name`               | Name of beneficiary            | ✓                  | 70       |
-| `iban`               | IBAN                           | ✓                  | 34       |
-| `currency`           | ISO-4217 currency code         | if `amount` given  | 3        |
-| `amount`             | Money amount                   |                    | 12       |
-| `purpose`            | SEPA purpose code              |                    | 4        |
-| `creditor_reference` | ISO-11649 creditor reference   |                    | 35       |
-| `reference`          | Unstructured reference         |                    | 140      |
-| `bto_info`           | Beneficiary to originator info |                    | 70       |
+| Attribute            | Description                    | required           | exclusive | max size |
+|----------------------|--------------------------------|--------------------|-----------|----------|
+| `bic`                | Bank Identifier Code           |                    |           | 11       |
+| `name`               | Name of beneficiary            | ✓                  |           | 70       |
+| `iban`               | IBAN                           | ✓                  |           | 34       |
+| `currency`           | ISO-4217 currency code         | if `amount` given  |           | 3        |
+| `amount`             | Money amount                   |                    |           | 12       |
+| `purpose`            | SEPA purpose code              |                    |           | 4        |
+| `creditor_reference` | ISO-11649 creditor reference   |                    | ✓         | 35       |
+| `reference`          | Unstructured reference         |                    | ✓         | 140      |
+| `bto_info`           | Beneficiary to originator info |                    |           | 70       |
 
 ## Limitations