(Bloomberg) -- Warren Buffett promised a hefty annual letter this year -- some 20,000 words -- as he celebrates his 50th anniversary running Berkshire Hathaway Inc. and charts its next half century.

The report, which is usually closer to 14,000 words, has long been a must-read on Wall Street -- full of homespun wisdom about investing and business. The contents are a closely guarded secret before the release as Buffett, 84, exchanges drafts with retired Fortune magazine writer Carol Loomis.

He’ll aim to put out a document on Saturday that shareholders in the Omaha, Neb.-based company will turn to long after he’s gone. As a bonus, Berkshire Vice Chairman Charles Munger, 91, will also contribute a letter.

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