arguments.php
public function explainFlag($flags, $explanation)
    {
        $flags                = is_array($flags) ? $flags : array($flags);
        $this->flag_sets[]    = $flags;
        $this->explanations[] = $explanation;
    }
public function explainFlag($flags, $explanation)
    {
        $flags                = is_array($flags) ? $flags : array($flags);
        $this->flag_sets[]    = $flags;
        $this->explanations[] = $explanation;
    }
Adds the explanation for a group of flags that all
have the same function.

@param string/array $flags       Flag and alternates. Don't
worry about leading dashes
as these are inserted automatically.
@param string       $explanation What that flag group does.