W5: Finish decorators

Author: tomasff

week5/w5.ipynb

@@ -557,7 +557,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "However, we can go one step further and make our code a bit nicer with *syntatic sugar*"
+    "However, we can go one step further and make our code a bit nicer with *syntatic sugar*.\n",
+    "`@requires_authorisation` is a decorator! Decorators provide us with a way of modifying the\n",
+    "behavior of a function without modifying its body."
    ]
   },
   {
@@ -591,6 +593,13 @@
     "deposit_monies(\"donald knuth\")"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "For now, you don't need to worry about the implementation details. The important part is understanding what decorators do: modify the behavior of an existing function."
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},