Add one more perk to Amazon's Prime subscription service.

The retailing giant unveiled Prime Reading, which gives subscribers to the $99-a-year service access to more than 1,000 Kindle books, as well as magazines and other published works for free.

Books including "Harry Potter" and "The Sorcerer's Stone" and "The Hobbit" are available, as well as travel guides from Lonely Planet. Subscribers also gain access to current issues of premium magazines including People and Sports Illustrated. Comic books, short works and children's books are also part of the package.

Prime Reading is among several book initiatives tied to Amazon's Kindle. The Kindle Owners Lending Library allows owners of a Kindle to download one book a month. There's also Kindle First, where users choose one of six new books to read before its official release. Kindle Unlimited is Amazon's spin on the Netflix model, where users can download and read one of thousands of books for a monthly subscription fee. Unlimited is separate from Amazon Prime.

The addition of Reading give Prime members another incentive to hang on to the Amazon subscription service. For $99 a year, users receive free two-day shipping on most Amazon items, along with access to the Amazon Video streaming service and Amazon Music.

Amazon has not disclosed how many people subscribe to Prime. Consumer Intelligence Research Partners estimated in June that Amazon has about 63 million Prime members.

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