Update README.md

README.md

@@ -36,7 +36,7 @@ deactivate
 
 ## 2. systems.py
 
-`systems.py` is a script which is intended to be used in the Systems group. It takes a CSV file as an input and allows you to:
+`systems.py` is a script which is intended to be used in the Systems group. Use the `-h` option to see all available parameters. This script allows you to:
 
 1. Print information about input documents on MDMS and GitLab (`-p` is optional):  
 e.g.: `python systems.py -m m55958,m55959,m56121 -p FileFormat/CENC --meeting 133`