diff --git a/visualize.Rmd b/visualize.Rmd
index 2266d08..2a112ef 100644
--- a/visualize.Rmd
+++ b/visualize.Rmd
@@ -582,7 +582,7 @@ The stacking is performed automatically by the __position adjustment__ specified
     The identity position adjustment is more useful for 2d geoms, like points,
     where it is the default.
     
-*   `position = "fill"` work like stacking, but makes each set of stacked bars
+*   `position = "fill"` works like stacking, but makes each set of stacked bars
     the same height. This makes it easier to compare proportions across 
     groups.