diff --git a/Graphviz.ipynb b/Graphviz.ipynb
index 34ea2c6..44e806b 100644
--- a/Graphviz.ipynb
+++ b/Graphviz.ipynb
@@ -9,13 +9,6 @@
     "module: [graphviz](https://graphviz.readthedocs.io/en/stable/)"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "https://pygraphviz.github.io/documentation/pygraphviz-1.6/"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": 11,