diff --git a/cbs_with_qrf.ipynb b/cbs_with_qrf.ipynb
index 2505f19e4df0f85828bc0f6151f842f485800e8d..0067d9109cbae62b20b57411f720fe4f20ea5d72 100644
--- a/cbs_with_qrf.ipynb
+++ b/cbs_with_qrf.ipynb
@@ -17,6 +17,8 @@
    "id": "6c1309a0",
    "metadata": {},
    "source": [
+    "# Introduction\n",
+    "\n",
     "In this tutorial, we investigate complete basis set extrapolation with two different all-electron density-functional-theory (DFT) codes, FHI-aims and exciting. These two codes use different basis sets in their solution of the eive similar physical results. We investigate in this notebook how we can effectively use quantile-random-forests to extrapolate DFT data to the complete-basis-set (CBS) limit. The CBS limit is defined as the basis set size that gives a total energy convergence error of less than 1E-4 eV/atom.\n",
     "\n",
     "We use a dataset of 71 elemental [1] and 81 binary solids [2] in three two all-electron density-functional-theory codes using different basis set sizes. The data was converged with respect to other all other DFT settings. The functional howevever is constant and is PBE. You can find more information about this work in [3].\n",