more specific description, explicitly note that codes must be invoked with 'racket'

README.md

@@ -1,13 +1,13 @@
 # Prediction Tracker
 
-Tools to maintain and interrogate a database of predictions and results.
+Tools to maintain and interrogate a database of predictions to track forecases and outcomes.
 
 ## Usage
 
 Before using, copy `config.rkt.example` to `config.rkt` and edit it with your desired database location.
-Then run `create_database.rkt` to create the sqlite3 file and create the `predictions` table.
+Then run `racket create_database.rkt` to create the sqlite3 file and create the `predictions` table.
 
-`update_predictions.rkt help` will provide instructions on how to add/update predictions and log outcomes. 
+`racket update_predictions.rkt help` will provide instructions on how to add/update predictions and log outcomes. 
 [Brier scores](https://en.wikipedia.org/wiki/Brier_score) are currently computed when outcomes are entered.
 More comprehensive Brier score reporting will be developed in the figure (score as a function of time, average Brier scores, etc.).