Does your software provide a help?

It doesn't matter if it is online, offline, command line, what-ever-line: your software should provide a help to the user.
There is a specific software engineering discipline to that (I will provide some links after), but you can start with some implementations for a help into your application: JavaHelp System.

I know that it is nothing new, but it if you don't know that you should take a look. It can give you some ideas.