The convenient "send to Kindle" feature lets users send documents, text from websites, and Kindle-compatible ebooks to their ereaders with a click from a web browser, desktop, email, or tablet. Now, Amazon is automatically adding those personal documents to a new folder on your Amazon Cloud Drive for easy retrieval.

"You can use Manage Your Kindle to see a list of your documents, re-deliver them to Kindle devices and free reading apps, delete them, or turn off auto-saving of documents to the cloud," Amazon says in an email sent to customers.

It's a useful feature that comes with a generous helping of free storage: the 5GB that you get with an Amazon Cloud Drive account, plus 5GB for personal documents from your Kindle. It's part of the company's plan to hook users on its cloud storage solution, which competes with the likes of Google Drive and Dropbox. Amazon originally pitched the service for photos and video, but it's now emphasizing documents as well.