diff --git a/09_unsupervised_learning.ipynb b/09_unsupervised_learning.ipynb
index 93ca751..10be3ea 100644
--- a/09_unsupervised_learning.ipynb
+++ b/09_unsupervised_learning.ipynb
@@ -3459,7 +3459,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The optimal number of clusters is not clear on this inertia diagram, as there is no obvious elbow, so let's stick with k=100."
+    "The optimal number of clusters is not clear on this inertia diagram, as there is no obvious elbow, so let's stick with k=120."
    ]
   },
   {