Laravel validating. One field must be greater than another

I'm trying to do some laravel validation.

I need to ensure that the field max rent is always great than min rent and to proivded a message letting the user know.

Here is my validation code in my controller

$this->validate($request, [
        "county" => "required",
        "town" => "required",
        "type" => "required",
        "min-bedrooms" => "required",
        "max-bedrooms" => "required",
        "min-bathrooms" => "required",
        "max-bathrooms" => "required",
        "min-rent" => "required|max4",
        "max-rent" => "required|max4",
      ]);

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