diff --git a/Milestone Project 1 - Advanced Solution.ipynb b/Milestone Project 1 - Advanced Solution.ipynb
index 0af4d2f..368f141 100644
--- a/Milestone Project 1 - Advanced Solution.ipynb	
+++ b/Milestone Project 1 - Advanced Solution.ipynb	
@@ -163,6 +163,10 @@
     "            print(\"Sorry, please input a number between 1-9.\")\n",
     "            continue\n",
     "\n",
+    "        if choice not in range(1,10):\n",
+    "            print(\"Sorry, please input a number between 1-9.\")\n",
+    "            continue\n",
+    "\n",
     "        if board[choice] == \" \":\n",
     "            board[choice] = mark\n",
     "            break\n",