diff --git a/README.md b/README.md
index b132ba6ea8f872e88e9b6c0731ee3199ed88d2cd..fec85a452347841340b425e11e8d1579c6032b9f 100644
--- a/README.md
+++ b/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