diff --git a/docs/introduction.ipynb b/docs/introduction.ipynb
index 6a4fbae..1369b4a 100644
--- a/docs/introduction.ipynb
+++ b/docs/introduction.ipynb
@@ -268,19 +268,6 @@
     "Notice how profiles with smaller half-light radii are affected (skewed) the most by the PSF convolution. For this reason, we must make corrections that account for half-light radius and the shape of the PSF. "
    ]
   },
-  {
-   "cell_type": "markdown",
-   "id": "2af4a5f9",
-   "metadata": {},
-   "source": [
-    "### Concentration Index and Sersic Index\n",
-    "\n",
-    "As mentioned before, concentration indices can be used as a proxy to  Sersic  indices. Since both properties measure the concentration of light, they are intimately related. Below we plot the relationship b/w the two quantities for ideal images (no noise and no PSF) of Sersic models, with different half-light radii:\n",
-    "\n",
-    "\n",
-    "![concentration_index_vs_n](images/concentration_index_vs_n.png)\n"
-   ]
-  },
   {
    "cell_type": "markdown",
    "id": "59bb24c5",
@@ -358,4 +345,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
\ No newline at end of file
+}