diff --git a/part4/4.JetTaggingPointCloud.ipynb b/part4/4.JetTaggingPointCloud.ipynb
index 7fd47d0..8be7be6 100644
--- a/part4/4.JetTaggingPointCloud.ipynb
+++ b/part4/4.JetTaggingPointCloud.ipynb
@@ -41,6 +41,7 @@
         "import h5py\n",
         "import numpy as np\n",
         "\n",
+        "#checking if we have GPUs\n",
         "print(\"Num GPUs Available: \", len(tf.config.list_physical_devices('GPU')))"
       ]
     },