add clarification to README

README.md

@@ -21,4 +21,4 @@ For the graph implementation specifically you need to install `graphframes` manu
 # Deploying:
 
 - Start the spark workload by either running `submit.sh` (slow) or `submit_graph.sh` (faster)
-- If you need to clean out the Database you can run `python3 clean.py`. Be wary that this wipes all data.
+- If you need to clean out the Database you can run `python3 clean.py`. Be wary that this wipes all table definitions and data.