diff --git a/Exercise1/exercise1.ipynb b/Exercise1/exercise1.ipynb
index 38a9fae..6386aae 100755
--- a/Exercise1/exercise1.ipynb
+++ b/Exercise1/exercise1.ipynb
@@ -1123,7 +1123,7 @@
     "num_iters = 400\n",
     "\n",
     "# init theta and run gradient descent\n",
-    "theta = np.zeros(3)\n",
+    "theta = np.zeros(4)\n",
     "theta, J_history = gradientDescentMulti(X, y, theta, alpha, num_iters)\n",
     "\n",
     "# Plot the convergence graph\n",