diff --git a/Collaborative Filtering/dataset/toy_dataset.csv b/Collaborative Filtering/dataset/toy_dataset.csv
index 8229a9c..c45eec7 100644
--- a/Collaborative Filtering/dataset/toy_dataset.csv	
+++ b/Collaborative Filtering/dataset/toy_dataset.csv	
@@ -1,6 +1,6 @@
-,action1,action2,action3,romantic1,romantic2,romantic3
+,index,action1,action2,action3,romantic1,romantic2,romantic3
 user 1,4,5,3,,2,1
 user 2,5,3,3,2,2,
 user 3,1,,,4,5,4
 user 4,,2,1,4,,3
-user 5,1,,2,3,3,4
\ No newline at end of file
+user 5,1,,2,3,3,4