diff --git a/src/main/java/com/iteratrlearning/shu_book/chapter_02/BankStatementDAO.java b/src/main/java/com/iteratrlearning/shu_book/chapter_02/BankStatementDAO.java
index 57a1e3c..fd1f12b 100644
--- a/src/main/java/com/iteratrlearning/shu_book/chapter_02/BankStatementDAO.java
+++ b/src/main/java/com/iteratrlearning/shu_book/chapter_02/BankStatementDAO.java
@@ -14,12 +14,12 @@ public BankTransaction read(final long id) {
         throw new UnsupportedOperationException();
     }
 
-    public BankTransaction update(final long id) {
+    public BankTransaction update(final BankTransaction bankTransaction) {
         // ...
         throw new UnsupportedOperationException();
     }
 
-    public void delete(final BankTransaction bankTransaction) {
+    public void delete(final long id) {
         // ...
         throw new UnsupportedOperationException();
     }