diff --git a/visualization/DataVisualization1.ipynb b/visualization/DataVisualization1.ipynb
index 4f8746870acf76568aa7d0b1b4118cf30117eaa1..406961c88aaca1e2215b75592f045297531894e6 100644
--- a/visualization/DataVisualization1.ipynb
+++ b/visualization/DataVisualization1.ipynb
@@ -1437,7 +1437,7 @@
    "source": [
     "# The End\n",
     "\n",
-    "This lesson was based on previous work by [Jeroen Laross](mailto://j.f.j.laros@lumc.nl) and Martijn Vermaat\n",
+    "This lesson was based on previous work by [Jeroen Laros](mailto://j.f.j.laros@lumc.nl) and Martijn Vermaat\n",
     "\n",
     "License: [Creative Commons Attribution 3.0 License (CC-by)](http://creativecommons.org/licenses/by/3.0)"
    ]