diff --git a/bind/example.ipynb b/bind/example.ipynb
index 2fc9d82..ebc324e 100644
--- a/bind/example.ipynb
+++ b/bind/example.ipynb
@@ -1007,7 +1007,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "df = G4s.run_batch(10, 'gamma',1 , 1)"
+    "df = G4s.run_batch(10, 'gamma', 1)"
    ]
   },
   {