diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d6dfac..b24d31b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ All notable changes will be documented in this file.
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
 ## [Unreleased]
+- Add `AccountBilling.multiSign`
 - Edit `MultiSignRecipientInfo` resource
 - Add `BatchSendingsEndpoint.MutiSignRecipients` endpoint
 - Add `MyEndpoint.updatePreferences` endpoint and `MyPreferences` resource
diff --git a/src/Resource/AccountBilling.php b/src/Resource/AccountBilling.php
index e99195a..f005c0b 100644
--- a/src/Resource/AccountBilling.php
+++ b/src/Resource/AccountBilling.php
@@ -65,4 +65,6 @@ class AccountBilling extends BaseResource
     public int $identifyNoneOrManualUsage;
 
     public bool $automaticTagsPlacement;
+
+    public bool $multiSign;
 }