diff --git a/P4. Matrix Factorization.ipynb b/P4. Matrix Factorization.ipynb
index 62e6c38..b80cdc0 100644
--- a/P4. Matrix Factorization.ipynb	
+++ b/P4. Matrix Factorization.ipynb	
@@ -966,7 +966,9 @@
     "# making changes to our implementation by considering additional parameters in the gradient descent procedure\n",
     "# seems to be the fastest option\n",
     "# please save the output in 'Recommendations generated/ml-100k/Self_SVDBaseline_reco.csv' and\n",
-    "# 'Recommendations generated/ml-100k/Self_SVDBaseline_estimations.csv'"
+    "# 'Recommendations generated/ml-100k/Self_SVDBaseline_estimations.csv'\n",
+    "\n",
+    "# link to the relevant Surprise documentation https://surprise.readthedocs.io/en/stable/matrix_factorization.html#matrix-factorization-based-algorithms"
    ]
   },
   {