diff --git a/README.md b/README.md
index fc1be20..ade43cb 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ A simple python3 (>=python3.6) script that supports parsing sml received on seri
 
 
 ## Usage
-python3 q3c\_logger SERIAL\_PORT
+python3 q3c\_logger.py SERIAL\_PORT
 
 
 # License