diff --git a/qlib/data/dataset/processor.py b/qlib/data/dataset/processor.py
index 194a46353..cafbf50bd 100644
--- a/qlib/data/dataset/processor.py
+++ b/qlib/data/dataset/processor.py
@@ -306,7 +306,7 @@ class CSRankNorm(Processor):
     Cross Sectional Rank Normalization.
     "Cross Sectional" is often used to describe data operations.
     The operations across different stocks are often called Cross Sectional Operation.
-    
+
     For example, CSRankNorm is an operation that grouping the data by each day and rank `across` all the stocks in each day.
     """