diff --git a/communicate-plots.Rmd b/communicate-plots.Rmd
index f20e4bf..f8b448b 100644
--- a/communicate-plots.Rmd
+++ b/communicate-plots.Rmd
@@ -232,7 +232,7 @@ The only limit is your imagination (and your patience at positioning annotations
 1.  What arguments to `geom_label()` control the appearance of the background
     box?
 
-1.  What are the four argument to `arrow()`? How do they work? Create a series
+1.  What are the four arguments to `arrow()`? How do they work? Create a series
     of plots that demonstrate the most important options.
 
 ## Scales