diff --git a/app/Models/AlertMailRule.php b/app/Models/AlertMailRule.php
index 2d7c358..be6c00a 100644
--- a/app/Models/AlertMailRule.php
+++ b/app/Models/AlertMailRule.php
@@ -13,6 +13,7 @@ class AlertMailRule extends Model
     protected $fillable = [
         'module',
         'plant',
+        'invoice_master_id',
         'rule_name',
         'email',
         'cc_emails',
@@ -23,8 +24,9 @@ class AlertMailRule extends Model
         'updated_by',
     ];
 
-    // public function plant(): BelongsTo
-    // {
-    //     return $this->belongsTo(Plant::class);
-    // }
+    public function invoiceMaster(): BelongsTo
+    {
+        return $this->belongsTo(InvoiceMaster::class);
+        //return $this->belongsTo(InvoiceMaster::class, 'invoice_master_id');
+    }
 }