diff --git a/transform.Rmd b/transform.Rmd
index 5f439e5..488d5ae 100644
--- a/transform.Rmd
+++ b/transform.Rmd
@@ -145,7 +145,7 @@ Whenever you start using complicated, multipart expressions in `filter()`, consi
 
 ### Missing values
 
-One important feature of R that can make comparison tricky are missing values, or `NA`s ("not applicables"). `NA` represents an unknown value so missing values are "contagious": almost any operation involving an unknown value will also be unknown.
+One important feature of R that can make comparison tricky are missing values, or `NA`s ("not availables"). `NA` represents an unknown value so missing values are "contagious": almost any operation involving an unknown value will also be unknown.
 
 ```{r}
 NA > 5