diff --git a/wrangle.Rmd b/wrangle.Rmd
index 4df5bed..732fb73 100644
--- a/wrangle.Rmd
+++ b/wrangle.Rmd
@@ -4,7 +4,7 @@
 
 With data, the relationships between values matter as much as the values themselves. Tidy data encodes those relationships.
 
-Throughout this book we work with "tibbles" instead of the traditional data frame. Tibbles _are_ data frames but they encode some patterns that make modern usage of R better. Unfortunately R is an old language, and things that made sense 10 or 20 years a go are no longer as valid. It's difficult to change base R without breaking existing code, so most innovation occurs in packages, providing new functions that you should use instead of the old ones.
+Throughout this book we work with "tibbles" instead of the traditional data frame. Tibbles _are_ data frames but they encode some patterns that make modern usage of R better. Unfortunately R is an old language, and things that made sense 10 or 20 years ago are no longer as valid. It's difficult to change base R without breaking existing code, so most innovation occurs in packages, providing new functions that you should use instead of the old ones.
 
 ```{r}
 library(tibble)