diff --git a/10_telephone/telephone.ipynb b/10_telephone/telephone.ipynb
index 45336b0..ad5fcdc 100644
--- a/10_telephone/telephone.ipynb
+++ b/10_telephone/telephone.ipynb
@@ -54,7 +54,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "It should also accept a `-s` or `--seed` argument for the random seed to ensure reproducible results"
+    "It should also accept a `-s` or `-seed` argument for the random seed to ensure reproducible results"
    ]
   },
   {