diff --git a/src/Resource/BatchSendingStats.php b/src/Resource/BatchSendingStats.php
index 3828bbf..3e06280 100644
--- a/src/Resource/BatchSendingStats.php
+++ b/src/Resource/BatchSendingStats.php
@@ -14,6 +14,8 @@ class BatchSendingStats extends BaseResource
 
     public int $waiting;
 
+    public int $totalEnvelopes;
+
     public int $sent;
 
     public int $completed;