diff --git a/schema.graphql b/schema.graphql
index 1b18406..9daf687 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -71,6 +71,7 @@ type Bid @entity {
 
     bidMultiplier: BigInt!
     auctionCreatedAt: BigInt! # timestamp when auction was created
+    category: Int!
     presetId: Int
 }
 
diff --git a/src/helper.ts b/src/helper.ts
index f835404..5ad7df1 100644
--- a/src/helper.ts
+++ b/src/helper.ts
@@ -45,6 +45,7 @@ export function getOrCreateBid(
 
         bid.bidMultiplier = auction.bidMultiplier;
         bid.auctionCreatedAt = auction.createdAt!;
+        bid.category = auction.category;
         bid.presetId = auction.presetId;
     }