diff --git a/numbers.Rmd b/numbers.Rmd
index 965d08d..c6977e4 100644
--- a/numbers.Rmd
+++ b/numbers.Rmd
@@ -205,7 +205,7 @@ flights |>
   )
 ```
 
-We can combine that with the `mean(is.na(x))` trick from Section \@ref(logical-summaries) to see how the proportion of delayed flights varies over the course of the day.
+We can combine that with the `mean(is.na(x))` trick from Section \@ref(logical-summaries) to see how the proportion of cancelled flights varies over the course of the day.
 The results are shown in Figure \@ref(fig:prop-cancelled).
 
 ```{r prop-cancelled}