diff --git a/vectors.Rmd b/vectors.Rmd
index f7baedd..2b4be16 100644
--- a/vectors.Rmd
+++ b/vectors.Rmd
@@ -129,7 +129,7 @@ y <- rep(x, 1000)
 pryr::object_size(y)
 ```
 
-`y` doesn't take up 1,000x as much memory as `x`, because each element of `y` is just a pointer to that same string. A pointer is 8 bytes, so 1000 pointers to a 136 B string is 8 * 1000 + 136 = 8.13 kB.
+`y` doesn't take up 1,000x as much memory as `x`, because each element of `y` is just a pointer to that same string. A pointer is 8 bytes, so 1000 pointers to a 152 B string is 8 * 1000 + 152 = 8.14 kB.
 
 ### Missing values