where does this 'all caps LIST-IMPORTS' come from?

[qknight]

With the source below:

use gumdrop::Options;
use std::{env, fs, process};

#[derive(Debug, Options)]
struct Args {
    #[options(help = "Prints the version", short = "v", long = "version")]
    version: bool,

    #[options(help = "Calls the list_imports function with a filename", short = "l", long = "list-imports")]
    list_imports: Option<String>,

    #[options(help = "Updates DLL bindings for <from> so it points to <to>", short = "s", long = "set-import")]
    set_import: bool,

    #[options(free)]
    free_args: Vec<String>,

    #[options(help = "Print this help message and exit", short = "h")]
    help: bool,
}

fn main() {
    let args = Args::parse_args_default_or_exit();

    if args.help {
        println!("{}", Args::usage());
        return;
    }

    if args.version {
        println!("fixPath version 1.0"); // FIXME read from cargo.toml
    } else if let Some(filename) = args.list_imports {
        println!("{}", filename);
    } else if args.set_import {
        if args.free_args.len() == 3 {
            println!(
                "set-import: {}, {}, {}",
                args.free_args[0], args.free_args[1], args.free_args[2]
            );
        } else {
            eprintln!("Error: --set-import requires exactly 3 arguments.");
        }
    } else {
        eprintln!("Error: one of --version, --list-imports or --set-import must be provided.");
        println!("{}", Args::usage());
        process::exit(1);
    }
}

why does the text LIST-IMPORTS in call caps appear?!

.\fixPath.exe -h
Usage: C:\Users\joschie\Desktop\Projects\fixPath\target\debug\fixPath.exe [OPTIONS]

Positional arguments:
  free_args

Optional arguments:
  -v, --version     Prints the version
  -l, --list-imports LIST-IMPORTS
                    Prints <file>'s DLL bindings
  -s, --set-import  Updates <file>'s DLL bindings <from> so it points to <to>
  -h, --help        Print this help message and exit

https://replit.com/@qknight/gumdrop-example#src/main.rs