diff --git a/iteration.Rmd b/iteration.Rmd
index 44e83c8..ee16200 100644
--- a/iteration.Rmd
+++ b/iteration.Rmd
@@ -529,7 +529,7 @@ There are a few differences between `map_*()` and `col_summary()`:
 
 ### Shortcuts
 
-There are a few shortcuts that you can use with `.f` in order to save a little typing. Imagine you want to fit a linear model to each group in a dataset. The following toy example splits the up the `mtcars` dataset in to three pieces (one for each value of cylinder) and fits the same linear model to each piece:  
+There are a few shortcuts that you can use with `.f` in order to save a little typing. Imagine you want to fit a linear model to each group in a dataset. The following toy example splits up the `mtcars` dataset into three pieces (one for each value of cylinder) and fits the same linear model to each piece:  
 
 ```{r}
 models <- mtcars %>%