Add note to file

README.md

@@ -27,7 +27,10 @@ atdb_csv_gen -h
 
 ### Caveats
 Only warns when files are encountered in either list, but not in both. Only creates a list of files which are present in both queries.
-
+### WARNING
+To execute this script you have to be able to connect to sdc-db.astron.nl. 
+This is not possible from outside the ASTRON network and without the proper credentials.
+Please contact the sys admin or the SDC architect.
 
 
 ## ATDB Result Gatherer