diff --git a/intro.Rmd b/intro.Rmd
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@@ -314,7 +314,7 @@ Twitter is one of the key tools that Hadley uses to keep up with new development
 ## Acknowledgements
 
 This book isn't just the product of Hadley and Garrett, but is the result of many conversations (in person and online) that we've had with the many people in the R community.
-There are a few people we'd like to thank in particular, because they have spent many hours answering our dumb questions and helping us to better think about data science:
+There are a few people we'd like to thank in particular, because they have spent many hours answering our questions and helping us to better think about data science:
 
 -   Jenny Bryan and Lionel Henry for many helpful discussions around working with lists and list-columns.