diff --git a/CM2005 Object Oriented Programming/Topic 4/4.4.11/OrderBook.h b/CM2005 Object Oriented Programming/Topic 4/4.4.11/OrderBook.h
index 3b155bc..e6421a5 100644
--- a/CM2005 Object Oriented Programming/Topic 4/4.4.11/OrderBook.h	
+++ b/CM2005 Object Oriented Programming/Topic 4/4.4.11/OrderBook.h	
@@ -19,6 +19,7 @@ class OrderBook
     /** returns the next time after the sent time in the orderbook
       * If no next timestamp is found, wraps to the start */
     std::string getNextTime(std::string timestamp);
+    void insertOrder(OrderBookEntry& order);
     static double getHighPrice(std::vector<OrderBookEntry>& orderList);
     static double getLowPrice(std::vector<OrderBookEntry>& orderList);
   private: