diff --git a/course-content/step4.md b/course-content/step4.md
index 01592d7..93a5bb6 100644
--- a/course-content/step4.md
+++ b/course-content/step4.md
@@ -223,7 +223,7 @@ SELECT
   ) AS eth_buy_qty,
   SUM(
     CASE
-      WHEN ticker = 'BTC' AND txn_type = 'SELL' THEN quantity
+      WHEN ticker = 'ETH' AND txn_type = 'SELL' THEN quantity
       ELSE 0
     END
   ) AS eth_sell_qty