diff --git a/README.md b/README.md
index 53e8563..9fc89db 100644
--- a/README.md
+++ b/README.md
@@ -15,4 +15,5 @@ jupyter notebook
 
 ## Credit
 The file `memorylib.py` in this repo is a copy from
-[QbeRoot/sms-livecol](https://github.com/QbeRoot/sms-livecol).
\ No newline at end of file
+[QbeRoot/sms-livecol](https://github.com/QbeRoot/sms-livecol).
+This file does NOT belong to sup39.