diff --git a/sna/0_Intro_Network_Analysis.ipynb b/sna/0_Intro_Network_Analysis.ipynb
index 7b14c48..3759f56 100644
--- a/sna/0_Intro_Network_Analysis.ipynb
+++ b/sna/0_Intro_Network_Analysis.ipynb
@@ -97,7 +97,7 @@
    },
    "source": [
     "## Licence\n",
-    "The notebook is freely licensed under under the [Creative Commons Attribution Share-Alike license](https://creativecommons.org/licenses/by/2.0/).  \n",
+    "The notebook is freely licensed under the [Creative Commons Attribution Share-Alike license](https://creativecommons.org/licenses/by/2.0/).  \n",
     "\n",
     "© Carlos A. Iglesias, Universidad Politécnica de Madrid."
    ]