Regularly adding money to growing companies is a surefire way to build lasting wealth in the stock market. It doesn't guarantee your stocks will rise every year, but what matters over the long term is owning shares of a group of companies that can grow revenue over many years. 

The market sell-off is offering up good deals on some promising growth stocks to hold for the long term. Let's look at two companies to consider adding to your portfolio in May.

Cloudflare (NYSE: NET) is a fast-growing cloud services provider that helps companies maintain secure, fast websites and applications. Several popular internet-facing companies, including and OpenAI, use Cloudflare's services. 

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Source Fool.com