diff --git a/Braintree/src/main/java/com/braintreepayments/api/models/ThreeDSecureRequest.java b/Braintree/src/main/java/com/braintreepayments/api/models/ThreeDSecureRequest.java
index <HASH>..<HASH> 100644
--- a/Braintree/src/main/java/com/braintreepayments/api/models/ThreeDSecureRequest.java
+++ b/Braintree/src/main/java/com/braintreepayments/api/models/ThreeDSecureRequest.java
@@ -45,6 +45,9 @@ public class ThreeDSecureRequest implements Parcelable {
     /**
      * Set the amount
      *
+     * This value must be a non-negative number and must match the currency format of the merchant account.
+     * It can only contain numbers and optionally one decimal point with exactly 2 decimal place precision (e.g., x.xx).
+     *
      * @param amount The amount of the transaction in the current merchant account's currency.
      * */
     public ThreeDSecureRequest amount(String amount) {
Update 3DS Amount Docstring (#<I>)

* Update ThreeDSecureRequest.amount docstring to explicity tell merchants to format with decimal