diff --git a/api/v1/serializers/payment.py b/api/v1/serializers/payment.py
index dd5029dc..93400cbf 100644
--- a/api/v1/serializers/payment.py
+++ b/api/v1/serializers/payment.py
@@ -15,6 +15,7 @@ class AuthorBalanceSerializer(serializers.ModelSerializer):
             'commission',
             'status',
             'payment',
+            'cause',
         )
 
         read_only_fields = (