diff --git a/README.md b/README.md
index 3662f50..67533fe 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 Change Athos energy (in eV) via the undulators
 
 ```bash
-SetAthosUndEnergy.sh 567
+SetAthosUndEnergy.py 567
 ```