diff --git a/schema.graphql b/schema.graphql
index cb6678c..3708fd4 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -167,6 +167,7 @@ type TokenOrder @entity {
 
     timestamp: Int!
     tx: Bytes
+    block: Int!
 }
 
 type TokenBalance @entity {
diff --git a/src/mappings/datatoken.ts b/src/mappings/datatoken.ts
index cb008f9..317395a 100644
--- a/src/mappings/datatoken.ts
+++ b/src/mappings/datatoken.ts
@@ -121,6 +121,7 @@ export function handleOrderStarted(event: OrderStarted): void {
   }
   order.marketFee = tokenToDecimal(event.params.marketFee.toBigDecimal(), 18)
   order.tx = tx
+  order.block = event.block.number.toI32()
 
   order.save()