A significant update to the Amazon Kindle app on iOS makes it easier for readers to purchase e-books directly from Amazon’s website.

Stuff Your Kindle Day is a great time to stock up your digital library. If you've had sci-fi books on the brain, you're in luck ... covering everything from tech to games to film.

But the Kindle’s Recaps feature is instead focused on book series and provides a “quick refresher on storylines and character arcs” before readers start the next book, Amazon says.