diff --git a/examples/Isosurface.ipynb b/examples/Isosurface.ipynb
index 295137b..558ead2 100644
--- a/examples/Isosurface.ipynb
+++ b/examples/Isosurface.ipynb
@@ -34,7 +34,7 @@
     "!{sys.executable} -m pip install simpleitkutilities\n",
     "!{sys.executable} -m pip install vtk\n",
     "!{sys.executable} -m pip install itkwidgets\n",
-    "!{sys.executable} -m pip install pydicom\n"
+    "!{sys.executable} -m pip install pydicom\n",
     "!{sys.executable} -m pip install dicom2stl\n"
    ]
   },