diff --git a/code_book/ch6.md b/code_book/ch6.md
index a608abe..0d43177 100644
--- a/code_book/ch6.md
+++ b/code_book/ch6.md
@@ -323,7 +323,7 @@ plt.show()
 
 ```
 
-Next we turn to exercise~6.8, which concerns the STAR model.
+Next we turn to example 6.1.2, which concerns the STAR model.
 
 We will use a `jitclass`, which requires us to set up parameters.