diff --git a/Cluster Analysis.ipynb b/Cluster Analysis.ipynb
index 87f385b..6a5d68e 100644
--- a/Cluster Analysis.ipynb	
+++ b/Cluster Analysis.ipynb	
@@ -6,7 +6,7 @@
    "source": [
     "# Cluster Analysis of Molecular Dynamics Trajectory Data\n",
     "\n",
-    "*A tutorial/workshop created by [Charlie Laughton](mailto:charles.laughton@nottingham.ac.uk)  for [CCP-BioSim](http://www.ccpbiosim.ac.uk)*\n",
+    "*A tutorial/workshop created by [Charlie Laughton](mailto:charles.laughton@nottingham.ac.uk)  for [CCP-BioSim](http://www.ccpbiosim.org)*\n",
     "\n",
     "### Introduction\n",
     "By the \"jumping amongst minima\" model of MD dynamics, we expect large ensembles/long trajectories to show clustering in conformational space. Cluster centres correspond to local minima conformations, and the sizes and shapes of the clusters tell us about the shape of the free energy surface.\n",