diff --git a/session_4/session_4.Rmd b/session_4/session_4.Rmd
index bead9a10a1af67bb0ab7ad441b2722bb47bf0223..a398a8a514d3041782a055b51c62d9cac1a03fa1 100644
--- a/session_4/session_4.Rmd
+++ b/session_4/session_4.Rmd
@@ -42,7 +42,7 @@ As usual you will also need the `tidyverse` library.
 
 <details><summary>Solution</summary>
 <p>
-```R
+```{r installP, eval = F}
 install.packages("nycflights13")
 ```