diff --git a/schema.graphql b/schema.graphql
index ebb1525..9fbf1e3 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -25,6 +25,7 @@ type User @entity {
   cmStatus: Boolean!
   cmStatusInLaunch: Boolean!
   gasRefunded: BigInt!
+  refundTransaction: String
 }
 
 type Reservation @entity {
diff --git a/src/mapping-refundSponsor.ts b/src/mapping-refundSponsor.ts
index b113022..593e007 100644
--- a/src/mapping-refundSponsor.ts
+++ b/src/mapping-refundSponsor.ts
@@ -5,5 +5,6 @@ export function handleRefundIssued (event: RefundIssued): void {
   let userID = event.params.refundedTo.toHexString()
   let user = createUser(userID)
   user.gasRefunded = event.params.amount
+  user.refundTransaction = event.transaction.hash.toHexString()
   user.save()
 }