diff --git a/src/Helper/ValidatorTrait.php b/src/Helper/ValidatorTrait.php
index 7330887..8da9fa8 100644
--- a/src/Helper/ValidatorTrait.php
+++ b/src/Helper/ValidatorTrait.php
@@ -239,6 +239,7 @@ protected function getAllowedNotificationType(): array
     protected function getAllowedTag(): array
     {
         return [
+            SendInterface::TAG_HUMAN_AGENT,
             SendInterface::TAG_CONFIRMED_EVENT_UPDATE,
             SendInterface::TAG_POST_PURCHASE_UPDATE,
             SendInterface::TAG_ACCOUNT_UPDATE,
diff --git a/src/SendInterface.php b/src/SendInterface.php
index 4dff32e..4925e03 100644
--- a/src/SendInterface.php
+++ b/src/SendInterface.php
@@ -19,6 +19,7 @@ interface SendInterface
     public const NOTIFICATION_TYPE_SILENT_PUSH = 'SILENT_PUSH';
     public const NOTIFICATION_TYPE_NO_PUSH = 'NO_PUSH';
 
+    public const TAG_HUMAN_AGENT = 'HUMAN_AGENT';
     public const TAG_BUSINESS_PRODUCTIVITY = 'BUSINESS_PRODUCTIVITY';
     public const TAG_COMMUNITY_ALERT = 'COMMUNITY_ALERT';
     public const TAG_CONFIRMED_EVENT_REMINDER = 'CONFIRMED_EVENT_REMINDER';