diff --git a/sio2/sisr/20-python/exo4.py b/sio2/sisr/20-python/exo4.py
index 40bdbe2..0b7bc06 100644
--- a/sio2/sisr/20-python/exo4.py
+++ b/sio2/sisr/20-python/exo4.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 
-# tips lancement : sudo python creatusr.py comptes.txt
+# tips lancement : sudo python exo4.py comptes.txt
 
 import os
 import sys