diff --git a/vignettes/parallel.Rmd b/vignettes/parallel.Rmd
index 5e466de..d82a644 100644
--- a/vignettes/parallel.Rmd
+++ b/vignettes/parallel.Rmd
@@ -15,12 +15,16 @@ vignette: >
 )
 ```
 
+By default, reads and writes are performed sequentially (i.e., not in parallel).
+Users can opt-in to parallel read/write functionality via `options`.
+
 ```{r}
 library(pizzarr)
-```
 
-By default, reads and writes are performed sequentially (i.e., not in parallel).
-Users can opt-in to parallel read/write functionality via `options`.
+if(!requireNamespace("pbapply", quietly = TRUE)) {
+    install.packages("pbapply")
+}
+```
 
 ## Simulate slow operations