diff --git a/src/main/java/bank/PrivateBank.java b/src/main/java/bank/PrivateBank.java
index 71c79b5..7d05b46 100644
--- a/src/main/java/bank/PrivateBank.java
+++ b/src/main/java/bank/PrivateBank.java
@@ -354,6 +354,7 @@ public class PrivateBank implements Bank, JsonSerializer<Transaction>, JsonDeser
      */
     @Override
     public List<Transaction> getTransactionsByType(String account, boolean positive) {
+        // an der Kopie der Liste Arbeiten oder nur Filtern und nicht entfernen
         List<Transaction> transactions = new ArrayList<>(this.accountsToTransactions.get(account));
         if (positive)
             transactions.removeIf(transaction -> transaction.calculate() >= 0);