In order to best help users understand how to use your custom commands, you can also document them with additional descriptions for the commands and parameters.

Run `help vip-greet` to examine our most recent command defined above:

```text
Usage:
  > vip-greet <vip> ...(names)

Flags:
  -h, --help - Display the help message for this command

Parameters:
  vip <string>
  ...names <string>

Input/output types:
  ╭───┬───────┬────────╮
  │ # │ input │ output │
  ├───┼───────┼────────┤
  │ 0 │ any   │ any    │
  ╰───┴───────┴────────╯
```

::: tip Cool!
You can see that Nushell automatically created some basic help for the command simply based on our definition so far. Nushell also automatically adds a `--help`/`-h` flag to the command, so users can also access the help using `vip-greet --help`.
:::

We can extend the help further with some simple comments describing the command and its parameters:

```nu
# Greet guests along with a VIP
#
# Use for birthdays, graduation parties,
# retirements, and any other event which
# celebrates an event # for a particular
# person.
def vip-greet [
  vip: string        # The special guest
   ...names: string  # The other guests
] {
  for $name in $names {
    print $"Hello, ($name)!"
  }

  print $"And a special welcome to our VIP today, ($vip)!"
}
```

Now run `help vip-greet` again to see the difference:

```text
Greet guests along with a VIP

Use for birthdays, graduation parties,
retirements, and any other event which
celebrates an event # for a particular
person.

Category: default

This command:
- does not create a scope.
- is not a built-in command.
- is not a subcommand.
- is not part of a plugin.
- is a custom command.
- is not a keyword.

Usage:
  > vip-greet <vip>


Flags:


  -h, --help - Display the help message for this command

Signatures:

  <any> | vip-greet[ <string>] -> <any>

Parameters:

  vip: <string> The special guest
  ...rest: <string> The other guests
```

Notice that the comments on the lines immediately before the `def` statement become a description of the command in the help system. Multiple lines of comments can be used. The first line (before the blank-comment line) becomes the Help `description`. This information is also shown when tab-completing commands.