Merge pull request #136 from jpuerto-psc/jpuerto/README-fix

Update README.md

README.md

@@ -19,7 +19,7 @@ Appyter enables you to serve that notebook on an executable webapp.
 
 If for some reason, `appyter` doesn't end up discoverable in your PATH, you can use `python3 -m appyter` instead.
 
-- A dotenv file (`.env`) or environment variables can be use to configure HOST, PORT, and PREFIX of the webserver.
+- A dotenv file (`.env`) or environment variables can be use to configure HOST (APPYTER_HOST), PORT (APPYTER_PORT), and PREFIX (APPYTER_PREFIX) of the webserver.
 - Some pre-configured profiles can be used for styling the form (`--profile=profile_name`) see `appyter/profiles`
 - In debug mode (`--debug`), changes to the notebook will automatically update the webapp.
 - Custom fields can be used by putting them in the directory of execution with the following format: