diff --git a/course-content/step4.md b/course-content/step4.md
index 01592d7..cbb9ba1 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
@@ -504,4 +504,4 @@ ORDER BY sold_eth_quantity DESC;
 | c9f0f8    | 2020-11-01     |  15.931855129247867 |
 
 [![forthebadge](./../images/badges/go-to-previous-tutorial.svg)](https://github.com/datawithdanny/sql-masterclass/tree/main/course-content/step3.md)
-[![forthebadge](./../images/badges/go-to-next-tutorial.svg)](https://github.com/datawithdanny/sql-masterclass/tree/main/course-content/step5.md)
\ No newline at end of file
+[![forthebadge](./../images/badges/go-to-next-tutorial.svg)](https://github.com/datawithdanny/sql-masterclass/tree/main/course-content/step5.md)