diff --git a/setup/diagnostics.ipynb b/setup/diagnostics.ipynb
index 3d73853..6b0eeae 100644
--- a/setup/diagnostics.ipynb
+++ b/setup/diagnostics.ipynb
@@ -10,7 +10,7 @@
     "## Please run this next cell to gather some important data\n",
     "\n",
     "Please run the next cell; it should take a minute or so to run (mostly the network test).\n",
-    "Rhen email me the output of the last cell to ed@edwarddonner.com.  \n",
+    "Then email me the output of the last cell to ed@edwarddonner.com.  \n",
     "Alternatively: this will create a file called report.txt - just attach the file to your email."
    ]
   },