Duchess Meghan just shared a private tradition that other young moms may end up wanting to steal for themselves.

While speaking on The Jamie Kern Lima Show podcast, Meghan revealed that she emails her son, Prince Archie, 5, and daughter, Princess Lilibet, 3, every night, as a way to create a sort of time capsule for them.

“One of our mom friends, she had said to me last year that she just created sort of secret email addresses for her kids that she’ll give to them at some point in their life,” Meghan said. “She would just send to them, you know, random pictures, the pictures that you aren’t going to put in a frame.”

Meghan loved the idea so much they she started doing it for her little ones. “I thought it was such a great time capsule to create for them because I used to have scrapbooks and photo albums, but we’re past that generation now,” the duchess said. “And so I created for the kids these email addresses—names again that you would never guess—that I will give to them at some point in their lives when they’re older.”

Meghan then revealed what kinds of things she writes in her messages. “Before I go to bed almost every night, I email them,” she said. “I email because it doesn’t have to be a heavy lift and you email them like: Here’s your report card from today; Oh my gosh, wasn’t it the funniest thing this morning?; Here’s a picture of you two having breakfast; or Here’s you playing with the dog. The things that you’re not going to frame, the things that you’re not going to put pen to paper in a journal, but they will end up at one point in their life, maybe when they’re 16 or when they’re 18, [where] I say, here’s an email that I’ve been keeping for you, for your whole life.”

At this point, Meghan began to tear up thinking about it, as she added, “Here’s everything and every moment that I wanted to tell you how much I love you and like how proud I am of you... it’s making me emotional.”

She closed by saying, “For them to be able to look back and go, oh my gosh, she has loved us so much. And that’s, I think, the best part about being a mom. We go back to like a love language or gifts. It’s not about the grandeur of a gesture. It’s about: ‘I see you. I’m nurturing you and I see you so deeply and I love being able to see your growth.’ And I’m just so proud of them... That’s the gift that will cost you nothing and it will mean everything to your children.”