diff --git a/3d_classification/torch/densenet_training_array.ipynb b/3d_classification/torch/densenet_training_array.ipynb
index 8198b01925..9de6bf09b8 100644
--- a/3d_classification/torch/densenet_training_array.ipynb
+++ b/3d_classification/torch/densenet_training_array.ipynb
@@ -1,5 +1,16 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 3D classification example based on DenseNet\n",
+    "\n",
+    "This tutorial shows an example of 3D classification task based on DenseNet and array format transforms.\n",
+    "\n",
+    "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/Project-MONAI/tutorials/blob/master/3d_classification/torch/densenet_training_array.ipynb)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},