diff --git a/README.md b/README.md
index eb072e6..985d5ca 100644
--- a/README.md
+++ b/README.md
@@ -788,7 +788,7 @@ class BankAccount {
 $bankAccount = new BankAccount();
 
 // Buy shoes...
-$bankAccount->withdrawBalance(-$shoesPrice);
+$bankAccount->withdrawBalance($shoesPrice);
 
 // Get balance
 $balance = $bankAccount->getBalance();