how to hide SELF parameter from the help message?

I use fire as suggested by "Version 4: fire.Fire()"

When I run "mycmd search --help" I get a nice help text but I'd like to remove the not useful/internal parameter SELF
If it my fault or a bug?

Thanks in advance

```
NAME
mycmd search - Search objects

SYNOPSIS
mycmd search SELF

DESCRIPTION
filter: is a query string like (samaccountname=matteo)

POSITIONAL ARGUMENTS
SELF

FLAGS
--filter=FILTER
```