Walmart just changed its name

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(CNN Money) -- Wal-Mart is now officially Walmart.

The company had been known as Wal-Mart Stores Inc. since 1970, but it announced a change in December. That became official today when it filed new incorporation papers in Delaware.

Customers won't notice the change. The corporate name is different, but Walmart storefronts, advertisements, bags and merchandise dropped the hyphen in 2008.

Why the switch? It's a nod to the digital era and its biggest rival, Amazon.

Walmart isn't only a retail store anymore. Although it has 11,600 locations around the world, the company Sam Walton founded in 1962 has become an online shopping juggernaut.