diff --git a/tibble.Rmd b/tibble.Rmd
index 3da104e..d16cc4b 100644
--- a/tibble.Rmd
+++ b/tibble.Rmd
@@ -16,7 +16,7 @@ library(tibble)
 
 ## Creating tibbles {#tibbles}
 
-The majority of the functions that you'll use in this book already produce tibbles. If you're working with functions from other packages, you might need to coerce a regular data frame a tibble. You can do that with `as_tibble()`:
+The majority of the functions that you'll use in this book already produce tibbles. If you're working with functions from other packages, you might need to coerce a regular data frame to a tibble. You can do that with `as_tibble()`:
 
 ```{r}
 as_tibble(iris)