diff --git a/transform.Rmd b/transform.Rmd
index 24aa5e0..c522288 100644
--- a/transform.Rmd
+++ b/transform.Rmd
@@ -293,7 +293,7 @@ flights[order(flights$year, flights$month, flights$day), , drop = FALSE]
 
 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()`