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