diff --git a/persistent_auditor.py b/persistent_auditor.py
index cb8f6ce..c25e082 100644
--- a/persistent_auditor.py
+++ b/persistent_auditor.py
@@ -39,15 +39,24 @@ def generate_report(total_units, failed_attempts):
 def load_inventory():
     try:
         with open("inventory.txt", "r") as inventory_file:
-            return int(inventory_file.readline().strip())
+            inventory = int(inventory_file.readline().strip())
+            history_line = inventory_file.readline().strip()
+            history = [] if not history_line else [int(value) for value in history_line.split(",")]
+            return inventory, history
     except FileNotFoundError:
-        return 0
+        return 0, []
 
 
-inventory = load_inventory()
+def save_inventory(inventory, transaction_history):
+    with open("inventory.txt", "w") as inventory_file:
+        inventory_file.write(f"{inventory}\n")
+        inventory_file.write(",".join(str(quantity) for quantity in transaction_history))
+        inventory_file.write("\n")
+
+
+inventory, transaction_history = load_inventory()
 total_units = 0
 failed_attempts = 0
-transaction_history = []
 
 print("=== Stock Auditor ===")
 print("Type 'quit' to exit.\n")
@@ -56,6 +65,7 @@ while True:
     quantity = get_valid_input()
 
     if quantity == "quit":
+        save_inventory(inventory, transaction_history)
         break
 
     tax = calculate_tax(quantity)