diff --git a/Code/Day 1_Data PreProcessing.md b/Code/Day 1_Data PreProcessing.md
index 569d0e6..53b0d10 100644
--- a/Code/Day 1_Data PreProcessing.md	
+++ b/Code/Day 1_Data PreProcessing.md	
@@ -47,7 +47,8 @@ X_train, X_test, Y_train, Y_test = train_test_split( X , Y , test_size = 0.2, ra
 ```python
 from sklearn.preprocessing import StandardScaler
 sc_X = StandardScaler()
-X_train = sc_X.fit_transform(X_train)
-X_test = sc_X.fit_transform(X_test)
+sc_X.fit(X_train)
+X_train = sc_X.transform(X_train)
+X_test = sc_X.transform(X_test)
 ```
 ### Done :smile: