You’ve probably never noticed it. Most people don’t. But there’s a page in your passport on which you can write your personal data and emergency contact information.

Personal data? Doesn’t your passport already include that? Nope. Since passports generally don’t expire for a decade, your address and phone number are not included anywhere in the document. So, if you lose your passport and a kind soul finds it, they can’t contact you. Info about the person to contact in case of an emergency isn’t listed there either.

So grab a pencil (remember those?) and fill in that page before each trip. Don’t use a pen, because your info is bound to change in 10 years. And be sure to fill out this page in your kids’ passports too. Because, you know, you never know.