diff --git a/Code/Day 1_Data_Preprocessing.ipynb b/Code/Day 1_Data_Preprocessing.ipynb
index 6ddcbda..9f26c9c 100644
--- a/Code/Day 1_Data_Preprocessing.ipynb	
+++ b/Code/Day 1_Data_Preprocessing.ipynb	
@@ -109,6 +109,9 @@
     }
    ],
    "source": [
+    "# If you use the newest version of sklearn, use the lines of code commented out",
+    "# from sklearn.impute import SimpleImputer",
+    "# imputer = SimpleImputer(missing_values=\"NaN\", strategy=\"mean\")",
     "from sklearn.preprocessing import Imputer\n",
     "# axis=0表示按列进行\n",
     "imputer = Imputer(missing_values = \"NaN\", strategy = \"mean\", axis = 0)\n",