diff --git a/notebooks/bonus-unit1/bonus-unit1.ipynb b/notebooks/bonus-unit1/bonus-unit1.ipynb
index c433256..58f20cf 100644
--- a/notebooks/bonus-unit1/bonus-unit1.ipynb
+++ b/notebooks/bonus-unit1/bonus-unit1.ipynb
@@ -415,7 +415,7 @@
         "\n",
         "1. `mlagents-learn <config>`: the path where the hyperparameter config file is.\n",
         "2. `--env`: where the environment executable is.\n",
-        "3. `--run_id`: the name you want to give to your training run id.\n",
+        "3. `--run-id`: the name you want to give to your training run id.\n",
         "4. `--no-graphics`: to not launch the visualization during the training.\n",
         "\n",
         "Train the model and use the `--resume` flag to continue training in case of interruption.\n",