diff --git a/packages/ripple-binary-codec/HISTORY.md b/packages/ripple-binary-codec/HISTORY.md
index eab2768410..91d3ef8e9f 100644
--- a/packages/ripple-binary-codec/HISTORY.md
+++ b/packages/ripple-binary-codec/HISTORY.md
@@ -11,7 +11,7 @@
 
 ### Added
 * Support for the Price Oracles amendment (XLS-47).
-* Add `NFTokenModify` transaction and add `tfMutable` flag in `NFTokenMint`
+* Support for the `DynamicNFT` amendment (XLS-46)
 
 ### Fixed
 * Better error handling/error messages for serialization/deserialization errors.
diff --git a/packages/xrpl/HISTORY.md b/packages/xrpl/HISTORY.md
index d41e1c537b..0f995f47a7 100644
--- a/packages/xrpl/HISTORY.md
+++ b/packages/xrpl/HISTORY.md
@@ -17,7 +17,7 @@ Subscribe to [the **xrpl-announce** mailing list](https://groups.google.com/g/xr
 * New `MPTAmount` type support for `Payment` and `Clawback` transactions
 * `parseTransactionFlags` as a utility function in the xrpl package to streamline transactions flags-to-map conversion
 * Support for XLS-70d (Credentials)
-* Add `NFTokenModify` transaction and add `tfMutable` flag in `NFTokenMint`
+* Support for the `DynamicNFT` amendment (XLS-46)
 
 ### Fixed
 * `TransactionStream` model supports APIv2
diff --git a/packages/xrpl/src/models/transactions/NFTokenModify.ts b/packages/xrpl/src/models/transactions/NFTokenModify.ts
index e67603fbf7..4246509671 100644
--- a/packages/xrpl/src/models/transactions/NFTokenModify.ts
+++ b/packages/xrpl/src/models/transactions/NFTokenModify.ts
@@ -38,7 +38,7 @@ export interface NFTokenModify extends BaseTransaction {
    * convert this field to the proper encoding.
    *
    * This field must not be an empty string. Omit it from the transaction or
-   * set to `undefined` value if you do not use it.
+   * set to `null` if you do not use it.
    */
   URI?: string | null
 }
diff --git a/packages/xrpl/test/models/NFTokenModify.test.ts b/packages/xrpl/test/models/NFTokenModify.test.ts
index 2f84793153..8d1bb9b0bf 100644
--- a/packages/xrpl/test/models/NFTokenModify.test.ts
+++ b/packages/xrpl/test/models/NFTokenModify.test.ts
@@ -38,4 +38,38 @@ describe('NFTokenModify', function () {
       'NFTokenModify: missing field NFTokenID',
     )
   })
+
+  it(`throws w/ URI being an empty string`, function () {
+    const invalid = {
+      TransactionType: 'NFTokenModify',
+      Account: 'rWYkbWkCeg8dP6rXALnjgZSjjLyih5NXm',
+      NFTokenID: TOKEN_ID,
+      Fee: '5000000',
+      Sequence: 2470665,
+      URI: '',
+    } as any
+
+    assert.throws(
+      () => validate(invalid),
+      ValidationError,
+      'NFTokenModify: URI must not be empty string',
+    )
+  })
+
+  it(`throws w/ URI not in hex format`, function () {
+    const invalid = {
+      TransactionType: 'NFTokenModify',
+      Account: 'rWYkbWkCeg8dP6rXALnjgZSjjLyih5NXm',
+      NFTokenID: TOKEN_ID,
+      Fee: '5000000',
+      Sequence: 2470665,
+      URI: '--',
+    } as any
+
+    assert.throws(
+      () => validate(invalid),
+      ValidationError,
+      'NFTokenModify: URI must be in hex format',
+    )
+  })
 })