Docs: Update to export PYTHONPATH variable
@@ -118,7 +118,7 @@ executes a different stage of the processing pipeline.
To see the set of available subcommands, run:
```bash
-PYTHONPATH=".:$PYTHONPATH" # set up module search path
+export PYTHONPATH=".:$PYTHONPATH" # set up module search path
python scripts/process.py -h # show the list of subcommands
```
