diff --git a/tutorials/useful_regex.ipynb b/tutorials/useful_regex.ipynb
index 14a9594..96bf73c 100644
--- a/tutorials/useful_regex.ipynb
+++ b/tutorials/useful_regex.ipynb
@@ -1,7 +1,7 @@
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-  "signature": "sha256:2e496899fa42e9e6ec0548cb798a7ca3f66221e0e43f94315ad4cbfed2e8fd54"
+  "signature": "sha256:295b519fef2aba4116d805cb3c00fc582bdc1a0b7da29b1ae36415f606592010"
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@@ -836,6 +836,14 @@
       "[[back to top](#Sections)]"
      ]
     },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Also this regex is only recommended for \"filtering\" purposes and not a ultimate way to parse HTML. For more information see this excellent discussion on StackOverflow:  \n",
+      "[http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/](http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/) "
+     ]
+    },
     {
      "cell_type": "code",
      "collapsed": false,