diff --git a/src/content/9/en/part9c.md b/src/content/9/en/part9c.md
index 53f0097cfe..6fab7b6ddd 100644
--- a/src/content/9/en/part9c.md
+++ b/src/content/9/en/part9c.md
@@ -1513,6 +1513,8 @@ const parseComment = (comment: unknown): string => {
 are easy to replace as follows:
 
 ```js
+import { z } from 'zod';
+
 const parseComment = (comment: unknown): string => {
   return z.string().parse(comment);  // highlight-line
 };