diff --git a/example/13-kor-value-portfolio.py b/example/13-kor-value-portfolio.py
index b870b16..59c4a7c 100644
--- a/example/13-kor-value-portfolio.py
+++ b/example/13-kor-value-portfolio.py
@@ -2,6 +2,7 @@ import pandas as pd
 import numpy as np
 import quantcommon
 
+# strategy/value 에서 구현
 
 #가치주 포트폴리오. PER, PBR이 낮은 회사 20개
 # DB 연결