Is your feature request related to a problem? Please describe.
It's almost impossible to guess what subcommands have been made for SimpleVoiceChat - all you receive is "Invalid command syntax".

Describe the solution you'd like
A /voicechat help subcommand would allow anyone to see valid subcommands and syntax, rather than an unhelpful message.

Describe alternatives you've considered
A possible alternative is to improve the unhelpful message with the correct syntax, or an "Unknown Subcommand" message at least.

Additional context
I think the plugin.yml file may be incomplete:

Please read the wiki for commands.
But I won't add any other commands to bukkit, since it is a pain to do with the bukkit API.