diff --git a/README.md b/README.md
index 103020e2923f98620851cd0777974607b24e8e88..9364e1eb0e0e9ab26deeecb120a65b372d0cfa8c 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,11 @@
 # battle_c
 
-# Jangwon Lee - Team 1
+## Jangwon Lee - Team 1
 
 실전코딩2 실습
+
+## printf
+
+### stdio.h
+
+* stderr, stdout, stdin에 대해서 배움
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