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@@ -28,15 +28,15 @@ Then go to `build/reports/jacoco/test/html/index.html` to see the result.
 
 The `fraudulentCreditCards` method in `com.github.wahyd4.creditcard.service.FraudChecker` receives list of transactions string and threshold to calculate all the credit cards which exceed the money threshold. 
 
-1. First, all the transaction string records will be parsed to a TransactionEntry object.
-2. Group all the transactions by hashed credit card id, the value of the key is all the records for that hashed id.
-3. Calculate the total money for every credit card to see if it exceeds the threshold, it will based on the sliding window.
-4. Return all the matched hashed credit cards as list.
+1. First, all the transaction string records will be parsed into a TransactionEntry object.
+2. Then loops the entries, it groups all the transactions by hashed credit card id, the value of the key is all the records for that hashed id.
+3. During this time, the program analyses all the records for the specific card comes from the current entry. If the records overs one `24` hours windows, then only keep the most recent `24` hours records. If the card has been marked as fraudulent, then it will skipped. 
+4. Calculates the total amount against the most recent `24` hours records, if the value greater than the threshold then mark the card as `fraudulent` and put it into the `map`.
+5. Returns all the matched hashed credit cards as a list.
 
 ## Assumptions
 
-* The `24` hour sliding window means, from the very latest record time we have for a credit card to its 24 hours ago. 
-And each credit card may have different time sliding windows based on their latest transaction time. 
+* `a sequence of transactions in chronological order` means the first item in the list is the oldest record.
 
 ## Highlights