diff --git a/Request/.ipynb_checkpoints/Heat Maps using Matplotlib and Seaborn-checkpoint.ipynb b/Request/.ipynb_checkpoints/Heat Maps using Matplotlib and Seaborn-checkpoint.ipynb
index 145dbaf..31cb089 100644
--- a/Request/.ipynb_checkpoints/Heat Maps using Matplotlib and Seaborn-checkpoint.ipynb	
+++ b/Request/.ipynb_checkpoints/Heat Maps using Matplotlib and Seaborn-checkpoint.ipynb	
@@ -999,6 +999,13 @@
     "<h1 align=\"center\"> Subplotting and 3D Heatmaps using Matplotlib and Seaborn </h1>"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "youtube tutorial: https://www.youtube.com/watch?v=NHwXkvwSd7E"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 13,
@@ -1632,7 +1639,6 @@
     "import matplotlib.pyplot as plt\n",
     "from pylab import *\n",
     "\n",
-    "\n",
     "fig = plt.figure(figsize=(8, 6))\n",
     "ax = fig.add_subplot(111, projection='3d')\n",
     "\n",
diff --git a/Request/Heat Maps using Matplotlib and Seaborn.ipynb b/Request/Heat Maps using Matplotlib and Seaborn.ipynb
index b32e0c2..31cb089 100644
--- a/Request/Heat Maps using Matplotlib and Seaborn.ipynb	
+++ b/Request/Heat Maps using Matplotlib and Seaborn.ipynb	
@@ -999,6 +999,13 @@
     "<h1 align=\"center\"> Subplotting and 3D Heatmaps using Matplotlib and Seaborn </h1>"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "youtube tutorial: https://www.youtube.com/watch?v=NHwXkvwSd7E"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 13,