diff --git a/15-Error_handling.ipynb b/15-Error_handling.ipynb
index 856fd0923d23210b00aa3ae0a4ab96c27dd446d9..443a15640f38c9bf7a259cd744f4b36629a19e6e 100644
--- a/15-Error_handling.ipynb
+++ b/15-Error_handling.ipynb
@@ -276,7 +276,9 @@
     "\n",
     "What `BadStartingPoint`, `StationaryStartingPoint`, ... are? They are \"types\" of exceptions, or, more generally, \"types\": like `int`, `str`, ...\n",
     "\n",
-    "However, they are user-defined types, or `classes`.\n"
+    "However, they are user-defined types, or `classes`.\n",
+    "\n",
+    "[Built-in Exceptions](https://docs.python.org/3/library/exceptions.html)"
    ]
   },
   {
@@ -571,7 +573,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 1,
    "metadata": {
     "slideshow": {
      "slide_type": "-"
@@ -589,7 +591,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 2,
    "metadata": {
     "slideshow": {
      "slide_type": "-"
@@ -609,7 +611,7 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "/Users/nicola/anaconda3/lib/python3.6/site-packages/ipykernel_launcher.py:1: DeprecationWarning: generator 'rangeIter' raised StopIteration\n",
+      "/home/nicola/Utils/miniconda3/lib/python3.6/site-packages/ipykernel_launcher.py:1: DeprecationWarning: generator 'rangeIter' raised StopIteration\n",
       "  \"\"\"Entry point for launching an IPython kernel.\n"
      ]
     }
@@ -650,7 +652,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.6"
+   "version": "3.6.7"
   }
  },
  "nbformat": 4,