diff --git a/notebooks/chap04.ipynb b/notebooks/chap04.ipynb
index a30ed05c..5fa18fb3 100644
--- a/notebooks/chap04.ipynb
+++ b/notebooks/chap04.ipynb
@@ -67,7 +67,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "We'll read the Facecook data downloaded from [SNAP](https://snap.stanford.edu/data/egonets-Facebook.html)"
+    "We'll read the Facebook data downloaded from [SNAP](https://snap.stanford.edu/data/egonets-Facebook.html)"
    ]
   },
   {