diff --git a/tools_numpy.ipynb b/tools_numpy.ipynb
index d64f1e0..dcb4030 100644
--- a/tools_numpy.ipynb
+++ b/tools_numpy.ipynb
@@ -368,8 +368,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "plt.hist(np.random.rand(100000), normed=True, bins=100, histtype=\"step\", color=\"blue\", label=\"rand\")\n",
-    "plt.hist(np.random.randn(100000), normed=True, bins=100, histtype=\"step\", color=\"red\", label=\"randn\")\n",
+    "plt.hist(np.random.rand(100000), density=True, bins=100, histtype=\"step\", color=\"blue\", label=\"rand\")\n",
+    "plt.hist(np.random.randn(100000), density=True, bins=100, histtype=\"step\", color=\"red\", label=\"randn\")\n",
     "plt.axis([-2.5, 2.5, 0, 1.1])\n",
     "plt.legend(loc = \"upper left\")\n",
     "plt.title(\"Random distributions\")\n",