diff --git a/src/core/binformat.js b/src/core/binformat.js
index 257ddd1c..b943b22b 100644
--- a/src/core/binformat.js
+++ b/src/core/binformat.js
@@ -400,6 +400,7 @@ exports.ledger = {
 };
 
 exports.metadata = [
+  [ 'DeliveredAmount'      , OPTIONAL ],
   [ 'TransactionIndex'     , REQUIRED ],
   [ 'TransactionResult'    , REQUIRED ],
   [ 'AffectedNodes'        , REQUIRED ]