DOC: Minor addition in README

README.md

@@ -16,6 +16,7 @@ CaosDB project.
 - Modify `pycaosdb.ini.template` and save it as `pycaosdb.ini`, taking care of the following points:
   - Certificates must be valid and be specified in `pycaosdb.ini`.
   - Server-side scripting paths must be given, otherwise server-side scripting will be omitted.
+  - Paths for the file tests must exist, or be creatable by the testing script and the server.
 - Run the tests with `pytest` or `pytest-3` (depending on your system).
 - If you want to run just a single test, you can also select a single test file:  
   `pytest-3 tests/test_issues.py`