diff --git a/examples/notebooks/Tutorial_4.ipynb b/examples/notebooks/Tutorial_4.ipynb
index 7458933..56953b9 100644
--- a/examples/notebooks/Tutorial_4.ipynb
+++ b/examples/notebooks/Tutorial_4.ipynb
@@ -90,7 +90,7 @@
     }
    ],
    "source": [
-    "!pip install modulo_vki"
+    "!pip install modulo-vki" # if not done, install modulo!
    ]
   },
   {