diff --git a/highchart.ipynb b/highchart.ipynb
index bf37c1c..a7c8aaf 100644
--- a/highchart.ipynb
+++ b/highchart.ipynb
@@ -114,7 +114,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
@@ -127,10 +127,10 @@
     {
      "data": {
       "text/html": [
-       "<svg height=\"100\" width=\"100\"><circle cx=\"50\" cy=\"40\" fill=\"yellow\" r=\"40\"></circle></svg>"
+       "<svg height=\"100\" width=\"100\" xmlns=\"http://www.w3.org/2000/svg\"><circle cx=\"50\" cy=\"40\" fill=\"yellow\" r=\"40\"></circle></svg>"
       ]
      },
-     "execution_count": 9,
+     "execution_count": 3,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -142,7 +142,7 @@
     ";;   <circle cx=\"50\" cy=\"50\" r=\"40\" stroke=\"green\" stroke-width=\"4\" fill=\"yellow\" />\n",
     ";; </svg>\n",
     "\n",
-    "(let [html [:svg {:height 100 :width 100}\n",
+    "(let [html [:svg {:height 100 :width 100 :xmlns \"http://www.w3.org/2000/svg\"}\n",
     "            [:circle {:cx 50 :cy 40 :r 40 :fill \"yellow\"}]]]\n",
     "    (-> html hiccup/html display/make-html))"
    ]