diff --git a/Exercise1/exercise1.ipynb b/Exercise1/exercise1.ipynb
index 0d245b5..fcc76a3 100755
--- a/Exercise1/exercise1.ipynb
+++ b/Exercise1/exercise1.ipynb
@@ -508,7 +508,7 @@
     "    X : array_like\n",
     "        The input dataset of shape (m x n+1).\n",
     "    \n",
-    "    y : arra_like\n",
+    "    y : array_like\n",
     "        Value at given features. A vector of shape (m, ).\n",
     "    \n",
     "    theta : array_like\n",