diff --git a/schema.graphql b/schema.graphql
index aa25ed2..0858d3c 100755
--- a/schema.graphql
+++ b/schema.graphql
@@ -133,6 +133,8 @@ type Pool @entity {
   rewardCut: BigInt!
   "Transcoder's fee share during the earnings pool's round"
   feeShare: BigInt!
+  "Cumulative fee factor for delegator fees calculation"
+  cumulativeFeeFactor: BigDecimal
 }
 
 """
diff --git a/src/mappings/ticketBroker.ts b/src/mappings/ticketBroker.ts
index 90d08f4..602fd93 100644
--- a/src/mappings/ticketBroker.ts
+++ b/src/mappings/ticketBroker.ts
@@ -10,6 +10,7 @@ import {
   createOrLoadTranscoderDay,
   getBlockNum,
   getEthPriceUsd,
+  integerFromString,
   makeEventId,
   makePoolId,
   ZERO_BD,
@@ -29,6 +30,9 @@ import {
   WinningTicketRedeemed,
   Withdrawal,
 } from "../types/TicketBroker/TicketBroker";
+import {
+  BondingManager,
+} from "../types/BondingManager/BondingManager";
 
 export function winningTicketRedeemed(event: WinningTicketRedeemed): void {
   let round = createOrLoadRound(getBlockNum());
@@ -97,9 +101,17 @@ export function winningTicketRedeemed(event: WinningTicketRedeemed): void {
   protocol.winningTicketCount = protocol.winningTicketCount + 1;
   protocol.save();
 
-  // update the transcoder pool fees
+  // update the transcoder pool fees and cummulative factors
   if (pool) {
     pool.fees = pool.fees.plus(faceValue);
+
+    let bondingManager = BondingManager.bind(event.address);
+    let earningsPool = bondingManager.getTranscoderEarningsPoolForRound(
+      Address.fromString(transcoder.id),
+      integerFromString(round.id)
+    );
+    pool.cumulativeFeeFactor = convertToDecimal(earningsPool.cumulativeFeeFactor);
+    
     pool.save();
   }