diff --git a/pdf-toolkit/pdftk-stamp-background.ipynb b/pdf-toolkit/pdftk-stamp-background.ipynb
index 23d8ff9..fa8eaf3 100644
--- a/pdf-toolkit/pdftk-stamp-background.ipynb
+++ b/pdf-toolkit/pdftk-stamp-background.ipynb
@@ -18,11 +18,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pdftk pdf/quilt.pdf background pdf/shapes.pdf output pdf/quilt-background.pdf "
+    "!pdftk pdf/hope.pdf background pdf/HOPE_blue.pdf output pdf/quilt-background.pdf "
    ]
   },
   {
@@ -36,13 +36,38 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 24,
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pdftk pdf/quilt.pdf stamp pdf/shapes.pdf output pdf/quilt-stamped.pdf "
+    "!pdftk pdf/map.pdf stamp pdf/A32.pdf output pdf/stamped.pdf\n",
+    "\n",
+    "# with many pages, stamp will be applied for each page"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "SyntaxError",
+     "evalue": "invalid syntax (<ipython-input-21-eca4999cbd7b>, line 1)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-21-eca4999cbd7b>\"\u001b[0;36m, line \u001b[0;32m1\u001b[0m\n\u001b[0;31m    $ pdftk A3.pdf cat 1-endeast output A32.pdf\u001b[0m\n\u001b[0m    ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m invalid syntax\n"
+     ]
+    }
+   ],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
   {
    "cell_type": "code",
    "execution_count": null,