diff --git a/src/main/java/com/example/zarinpal/data/remote/dto/refund/GraphRefundModel.kt b/src/main/java/com/example/zarinpal/data/remote/dto/refund/GraphRefundModel.kt
index f53f5ff..b93c233 100644
--- a/src/main/java/com/example/zarinpal/data/remote/dto/refund/GraphRefundModel.kt
+++ b/src/main/java/com/example/zarinpal/data/remote/dto/refund/GraphRefundModel.kt
@@ -1,16 +1,17 @@
 package com.example.zarinpal.data.remote.dto.refund
 
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 /**
- * Represents a GraphQL request for initiating a payment refund.
+ * Represents the GraphQL request for initiating a payment refund.
  *
- * @property query GraphQL query string to execute the refund.
- * @property variables Parameters required to process the refund,
+ * @property query The GraphQL query string to be executed for the refund operation.
+ * @property variables Contains the variables required for the refund operation,
  * including session ID, description, method, reason, amount, and token.
  */
 @Serializable
 data class GraphRefundModel(
-    val query: String,
+    val query :String,
     val variables: PaymentRefundRequest
-)
+)
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