diff --git a/Final/Task4/refcount.hpp b/Final/Task4/refcount.hpp
index eeccdfda1e5ea531ba4ac348b06e67c3cd7adf94..6a6468b7b73b3b7855d3a7c9ba32a6821482caef 100644
--- a/Final/Task4/refcount.hpp
+++ b/Final/Task4/refcount.hpp
@@ -64,3 +64,5 @@ public:
 };
 
 #endif // REF_COUNT_HPP
+
+// Reference OPENAI CHATGPT, 2023.  ChatGPT response to James Tulloch, (personal communication, 6th November)