Shares of Coinbase rose sharply Tuesday on news that it would be included in the benchmark S&P 500 this month.

S&P 500 index on May 19, S&P Dow Jones Indices announced late Monday. Coinbase shares COIN rallied nearly 20% on Tuesday. The inclusion is a “watershed” moment for the crypto exchange and the industry,

It’s the first time that a cryptocurrency company will be included on the closely followed index. Coinbase shares are up double digits on the news. One of the world’s most well-known stock market indexes,