diff --git a/xexe/rate_writing.py b/xexe/rate_writing.py
index 6b661cd..8996a3b 100644
--- a/xexe/rate_writing.py
+++ b/xexe/rate_writing.py
@@ -1,4 +1,5 @@
 import csv
+import datetime
 import pathlib
 from abc import ABC, abstractmethod
 
@@ -20,9 +21,11 @@ class CSVRateWriter(RateWriter):
     def write_rates(self, rates: ExchangeRates) -> None:
         with open(self.output_file_path, mode="w") as csv_file:
             csv_writer = csv.writer(csv_file)
-            csv_writer.writerow(["from_currency", "to_currency", "rate", "rate_date"])
+            csv_writer.writerow(
+                ["from_currency", "to_currency", "rate", "rate_date", "exported_at"]
+            )
 
-            # Write the exchange rate data
+            exported_at = datetime.datetime.now()
             for rate in rates._rate_index.values():
                 csv_writer.writerow(
                     [
@@ -30,5 +33,6 @@ class CSVRateWriter(RateWriter):
                         rate.to_currency.value,
                         rate.rate.amount,
                         rate.rate_date.strftime("%Y-%m-%d"),
+                        exported_at.isoformat(timespec="seconds"),
                     ]
                 )