diff --git a/layers.qmd b/layers.qmd
index a69a288..268bb24 100644
--- a/layers.qmd
+++ b/layers.qmd
@@ -751,7 +751,7 @@ Each stat is a function, so you can get help in the usual way, e.g., `?stat_bin`
 4.  What variables does `stat_smooth()` compute?
     What arguments control its behavior?
 
-5.  In our proportion bar chart, we need to set `group = 1`.
+5.  In our proportion bar chart, we needed to set `group = 1`.
     Why?
     In other words, what is the problem with these two graphs?