diff --git a/layers.qmd b/layers.qmd
index 33e8276..16bebc7 100644
--- a/layers.qmd
+++ b/layers.qmd
@@ -763,7 +763,7 @@ Each stat is a function, so you can get help in the usual way, e.g. `?stat_bin`.
     What do they have in common?
 
 4.  What variables does `stat_smooth()` compute?
-    What parameters control its behavior?
+    What arguments control its behavior?
 
 5.  In our proportion bar chart, we need to set `group = 1`.
     Why?