diff --git a/ch04.ipynb b/ch04.ipynb
index 1a8639735..becce7ad9 100644
--- a/ch04.ipynb
+++ b/ch04.ipynb
@@ -712,7 +712,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "points = np.arange(-5, 5, 0.01) # 100 equally spaced points\n",
+    "points = np.arange(-5, 5, 0.1) # 100 equally spaced points\n",
     "xs, ys = np.meshgrid(points, points)\n",
     "ys"
    ]
@@ -1221,4 +1221,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
\ No newline at end of file
+}