How to customize validation rule message?

Hi, I want to customize the message of this particular rule but I can't find it in docs.
Forms\Components\Toggle::make('default')
                            ->label('Make it the default color combination?')
                            ->onColor('success')
                            ->offColor('gray')
                            ->exists(modifyRuleUsing: function (Exists $rule) {
                                return $rule->where('default', true);
                            })
                            ->validationAttribute('default')
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