Update README.md

README.md

@@ -71,5 +71,5 @@ Optionally `2>&1 | tee fRPC_progress.txt` can also be added at the end of the co
 ## Elastics scattering monitor and luminosity calculator
 
 ```bash
-./build/bin/elastics_monitor lumiParFile inputFiles
+./build/bin/elastics_monitor inputFiles
 ```