diff --git a/functions.Rmd b/functions.Rmd
index 19b7438..e5a52ad 100644
--- a/functions.Rmd
+++ b/functions.Rmd
@@ -4,6 +4,13 @@ title: Expressing yourself
 output: bookdown::html_chapter
 ---
 
+```{r, include = FALSE}
+knitr::opts_chunk$set(
+  cache = TRUE,
+  fig.path = "figures/"
+)
+```
+
 # Expressing yourself in code
 
 Code is a means of communication, not just to the computer, but to other people. This is important because every project you undertake is fundamentally collaborative, and even if you're not working with other people you'll definitely be working with future-you.