diff --git a/python-intro/exercises/ex09_lists.ipynb b/python-intro/exercises/ex09_lists.ipynb
index 3f1cafc..c51bbe7 100644
--- a/python-intro/exercises/ex09_lists.ipynb
+++ b/python-intro/exercises/ex09_lists.ipynb
@@ -11,7 +11,7 @@
     "tags": []
    },
    "source": [
-    "# Exercise 09: Lists"
+    "# Exercise 9: Lists"
    ]
   },
   {