Cerence (CRNC) could be a solid addition to your portfolio given a notable revision in the company's earnings estimates. While the stock has been gaining lately, the trend might continue since its earnings outlook is still improving.The upward trend in estimate revisions for this automotive artificial intelligence developer reflects growing optimism of analysts on its earnings prospects, which should get reflected in its stock price. After all, empirical research shows a strong correlation between trends in earnings estimate revisions and near-term stock price movements. Our stock rating tool -- the Zacks Rank -- is principally built on this insight.The five-grade Zacks Rank system, which ranges from a Zacks Rank #1 (Strong Buy) to a Zacks Rank #5 (Strong Sell), has an impressive externally-audited track record of outperformance, with Zacks #1 Ranked stocks generating an average annual return of +25% since 2008.Consensus earnings estimates for the next quarter and full year have moved considerably higher for Cerence, as there has been strong agreement among the covering analysts in raising estimates.The chart below shows the evolution of forward 12-month Zacks Consensus EPS estimate:12 Month EPSCurrent-Quarter Estimate RevisionsThe company is expected to earn $0.46 per share for the current quarter, which represents a year-over-year change of +6.98%.Over the last 30 days, the Zacks Consensus Estimate for Cerence has increased 134.62% because one estimate has moved higher compared to no negative revisions.Current-Year Estimate RevisionsFor the full year, the company is expected to earn $1.93 per share, representing a year-over-year change of +14.88%.In terms of estimate revisions, the trend for the current year also appears quite encouraging for Cerence. Over the past month, one estimate has moved higher compared to no negative revisions, helping the consensus estimate increase 92.98%.Favorable Zacks RankThanks to promising estimate revisions, Cerence currently carries a Zacks Rank #2 (Buy). The Zacks Rank is a tried-and-tested rating tool that helps investors effectively harness the power of earnings estimate revisions and make the right investment decision. You can see the complete list of today's Zacks #1 Rank (Strong Buy) stocks here.Our research shows that stocks with Zacks Rank #1 (Strong Buy) and 2 (Buy) significantly outperform the S&P 500.Bottom LineCerence shares have added 25.2% over the past four weeks, suggesting that investors are betting on its impressive estimate revisions. So, you may consider adding it to your portfolio right away to benefit from its earnings growth prospects.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Cerence Inc. (CRNC): Get Free Report To read this article on Zacks.com click here.