Jim Cramer: Buy Penn National Stock When It Comes Down

S&P Dow Jones Indices announced changes to the S&P 500 index after the bell Friday that will add four companies and remove four others from the benchmark as of March 22.

Penn National  (PENN) - Get Report and Caesars  (CZR) - Get Report, as well as NXP Semiconductors  (NXPI) - Get Report and Generac Holdings, will be added to the S&P. 

Jim Cramer, who has long been a fan of Penn, weighs in on the changes and when investors can buy Penn.

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