diff --git a/data-visualize.qmd b/data-visualize.qmd
index ed60cf9..2397f18 100644
--- a/data-visualize.qmd
+++ b/data-visualize.qmd
@@ -699,6 +699,7 @@ Based on the plot on the left, we can see that Gentoo penguins all live on Bisco
 #|   Bar plots of penguin species by island (Biscoe, Dream, and Torgersen).
 #|   On the right, frequencies of species are shown. On the left, relative 
 #|   frequencies of species are shown.
+#| layout-ncol: 2
 
 ggplot(penguins, aes(x = island, fill = species)) +
   geom_bar()