diff --git a/transform.Rmd b/transform.Rmd
index 1b68193..ce142ee 100644
--- a/transform.Rmd
+++ b/transform.Rmd
@@ -243,7 +243,7 @@ arrange(df, desc(x))
 
 1.  Sort `flights` to find the fastest flights.
 
-1.  Which flights travlled the longest? Which travelled the shortest?
+1.  Which flights travelled the longest? Which travelled the shortest?
 
 ## Select columns with `select()`