diff --git a/ch04/01_main-chapter-code/ch04.ipynb b/ch04/01_main-chapter-code/ch04.ipynb
index 6b07c76..5d1732a 100644
--- a/ch04/01_main-chapter-code/ch04.ipynb
+++ b/ch04/01_main-chapter-code/ch04.ipynb
@@ -224,7 +224,7 @@
"id": "9665e8ab-20ca-4100-b9b9-50d9bdee33be",
"metadata": {},
"source": [
- "
"
+ "
"
]
},
{