If you are married and you let your spouse use your vehicle. It is advisable to inform your insurance company so that if your spouse gets into trouble, it can be covered by your car insurance. If you fail to do so, don’t get upset if your claim was rejected. You need to inform your insurance company for the list of people who regularly uses your car. If so don’t let your vehicle borrowed by others. If you want to add a driver to your policy as set in your car insurance then, you can check out for more insurance company. Having a secret is okay, but it is not okay if you will keep a secret especially if it involves your safety and your car.