diff --git a/factors.Rmd b/factors.Rmd
index 3fd38aa..c48dacd 100644
--- a/factors.Rmd
+++ b/factors.Rmd
@@ -329,3 +329,5 @@ gss_cat %>%
     Independent changed over time?
 
 1.  How could you collapse `rincome` into a small set of categories?
+
+1.  Notice there are 9 groups (excluding other) in the `fct_lump` example above. Why not 10? (Hint: type `?fct_lump`, and find the default for the argument `other_level` is "Other".)