diff --git a/Polymorphism/README.md b/Polymorphism/README.md
index bb91c9b5..0608650c 100644
--- a/Polymorphism/README.md
+++ b/Polymorphism/README.md
@@ -15,3 +15,4 @@
 * [가상 소멸자]
 * [상향 형변환]
 * [순수 가상 함수] 
+.