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
diff --git a/visualize.Rmd b/visualize.Rmd
index bb88f6b..fc2f659 100644
--- a/visualize.Rmd
+++ b/visualize.Rmd
@@ -249,7 +249,7 @@ ggplot(data = mpg) +
   facet_grid(drv ~ cyl)
 ```
 
-If you prefer to not facet in the rows or columns dimension, use a `.` instead of a variable name, e.g. `+ facet_grid(. ~ clarity)`.
+If you prefer to not facet in the rows or columns dimension, use a `.` instead of a variable name, e.g. `+ facet_grid(. ~ cyl)`.
 
 ### Exercises