Update README.md

README.md

@@ -115,6 +115,11 @@ git clone https://gitlab.camras.nl/marc/backend.git
 Check for each programme if DT Obs can find the proper location. Each class can
 be tested individually if needed.
 
+Add PYTHONPATH for createpointings
+```
+export PYTHONPATH=createpointings:${PYTHONPATH}
+```
+
 # TODO
 - define central frequency
 - internationalization