diff --git a/notebooks/seminar03.ipynb b/notebooks/seminar03.ipynb
index c59117e29f64921a673e886c2b1c2497829e950e..ed563c8d50cabe787da5e26433534a4e979734d3 100644
--- a/notebooks/seminar03.ipynb
+++ b/notebooks/seminar03.ipynb
@@ -1016,7 +1016,10 @@
     "\n",
     ".\n",
     "\n",
-    "spoiler\n",
+    "![Spoiler Alert](https://imgs.xkcd.com/comics/spoiler_alert.png)\n",
+    "([Spoiler Alert](https://xkcd.com/109/), Randall Munroe)\n",
+    "\n",
+    ".\n",
     "\n",
     ".\n",
     "\n",
@@ -1188,6 +1191,8 @@
     "\n",
     ".\n",
     "\n",
+    "\n",
+    "\n",
     ".\n",
     "\n",
     "Die Lösung finden Sie hier: http://thinkpython2.com/code/do_four.py"
@@ -1231,6 +1236,15 @@
     "\n",
     ".\n",
     "\n",
+    "![Spoiler Alert](https://imgs.xkcd.com/comics/spoiler_alert.png)\n",
+    "([Spoiler Alert](https://xkcd.com/109/), Randall Munroe)\n",
+    "\n",
+    ".\n",
+    "\n",
+    ".\n",
+    "\n",
+    ".\n",
+    "\n",
     "Mein \"Fuß in der Tür\" war, dass ich von Hand eine Tabelle mit den Ergebnissen für die ersten `n` Zahlen gebaut habe:\n",
     "\n",
     "|  n | Liste     | Produkt |\n",