diff --git a/notebooks/pe-lecture.ipynb b/notebooks/pe-lecture.ipynb
index 992cb36..91f33a8 100644
--- a/notebooks/pe-lecture.ipynb
+++ b/notebooks/pe-lecture.ipynb
@@ -41,7 +41,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Below we are loading the necessary libraries, utilities, and configurations."
+    "Below we are loading the necessary libraries, utilities, and configurations. \n",
+    "\n",
+    "Please install `dotenv` as follows: `pip install python-dotenv`"
    ]
   },
   {