diff --git a/exercises/ex08_solution/hartree-fock.ipynb b/exercises/ex08_solution/hartree-fock.ipynb
index c538bd0183e512b495c89bc4dcb2a7529b0a68fc..6edac4587c9e010ccb0b3c4d05c81f9fcce9056d 100644
--- a/exercises/ex08_solution/hartree-fock.ipynb
+++ b/exercises/ex08_solution/hartree-fock.ipynb
@@ -352,7 +352,29 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Don't forget to add 1 to the resulting energy: during derivation, the repulsion of the H cores (which is normalised to $1$ Hartree) has been left out."
+    "Don't forget to add 1 to the resulting energy: during derivation, the repulsion of the H cores ( $\\frac{1}{|R_A-R_B|}=1$ Hartree in the Hamiltonian) has been dropped."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "collapsed": true
+   },
+   "source": [
+    "## Drawbacks"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "* The Born-Oppenheimer approximation neglects nuclei, although this doesn't factor too strongly into the examples we have used.\n",
+    "\n",
+    "* The choice of a too small basis and/or one consisting of too simple functions (here GTOs) can be insufficient to describe the system accurately. Bigger sets (STO-6G) and/or more elaborate functions get computationally expensive quickly.\n",
+    "\n",
+    "* The wave function is approximated by a single Slater determinant. Each electron sees the average density of all other electrons (compare: mean field theory), which doesn't factor in electron correlation.\n",
+    "\n",
+    "The last point is addressed extensively in \"post-Hartree-Fock\" methods (e.g. using a sum of \"excited\" Slater determinants)."
    ]
   },
   {