diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cae35a..d33d7a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 - Add `AccountBilling.cancelAt`
 - Add `AccountEndpoint.createDefaultSubscription` endpoint
 - Add `SignatureScenario.latestVersionInfo`
+- Add `EnvelopeTemplateTag`.`customIdentifier` in to resource
 
 ## [2.5.0] - 2024-10-14
 - Add `AccountBilling.automaticTagsPlacement`
diff --git a/src/Resource/EnvelopeTemplateTag.php b/src/Resource/EnvelopeTemplateTag.php
index 25c68b3..3696b51 100644
--- a/src/Resource/EnvelopeTemplateTag.php
+++ b/src/Resource/EnvelopeTemplateTag.php
@@ -58,4 +58,6 @@ class EnvelopeTemplateTag extends BaseResource
     public bool $renderInteractive;
 
     public ?string $format;
+
+    public ?string $customIdentifier;
 }