How do I get help for the CLI refdata currencies command?

./ores.cli refdata currencies --help

currencies - Manage currencies

Usage: ores.cli currencies <operation> [options]

Available operations:
   import         Import currencies from ORE XML files
   export         Export currencies to ORE XML or CSV (external formats)
   list           List currencies as JSON or table (internal formats)
   delete         Delete a currency by ISO code
   add            Add currencies from JSON files

For operation-specific options, use: currencies <operation> --help