"heroku db:pull --exclude table_name" How to exclude more than one table?

I can't find anywhere how to use "--exclude". When I try this code ``` heroku help db:pull ``` I get this: ``` Usage: heroku db:pull [DATABASE_URL] pull heroku data down into your local database DATABASE_URL should reference your local database. if not specified, it will be guessed from config/database.yml -c, --chunksize SIZE # specify the number of rows to send in each batch -d, --debug # enable debugging output -e, --exclude TABLES # exclude the specified tables from the pull -f, --filter REGEX # only pull certain tables -r, --resume FILE # resume transfer described by a .dat file -t, --tables TABLES # only pull the specified tables ``` ok I understand how to use "-e" with one table, but I want to exclude more than one table. It is not working: ``` heroku db:pull -e users, versions ```