diff --git a/README.md b/README.md
index 44d11e1..58c5606 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ masterMacs exposes the following IOC shell functions:
 - `el734Controller`: Create a new controller object.
 - `el734Axis`: Create a new axis object.
 
-The full el734X.cmd file looks like this:
+The full el734_X.cmd file looks like this:
 
 ```
 # Define the name of the controller and the corresponding port