diff --git a/18_reinforcement_learning.ipynb b/18_reinforcement_learning.ipynb
index 67483b3..bd29513 100644
--- a/18_reinforcement_learning.ipynb
+++ b/18_reinforcement_learning.ipynb
@@ -23,7 +23,7 @@
"
Run in Google Colab\n",
" \n",
"