diff --git a/notebooks/04_Generalisation_and_overfitting.ipynb b/notebooks/04_Generalisation_and_overfitting.ipynb
index 5941269..6503533 100644
--- a/notebooks/04_Generalisation_and_overfitting.ipynb
+++ b/notebooks/04_Generalisation_and_overfitting.ipynb
@@ -257,6 +257,7 @@
     "ax = fig.add_subplot(1, 1, 1)\n",
     "for weight, centre in zip(weights, centres):\n",
     "    ys += weight * basis_function(xs, centre, scale)\n",
+    "ys += bias\n",
     "ax.plot(xs, ys)\n",
     "ax.set_xlabel('Input', fontsize=14)\n",
     "ax.set_ylabel('Output', fontsize=14)"