Retro , a friend-focused, photo-sharing app with roughly a million users, is adding a new feature that lets you time-travel through your old photo memories from your phone’s Camera Roll. While the app today offers a way to share photos of what’s happening during your week with a private group of friends, or create shared albums, this latest addition, dubbed “Rewind,” is private to you — unless you choose to share the photos with others.

Retro’s co-founder, Nathan Sharp, explains that the idea for Rewind was inspired by a feature the app already offered and was proving popular.

Today, at the end of the row showcasing the photos your friends shared during the week, there’s a card you can tap that will let you view your own photos from that same week a year ago.

However, that option was

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