diff --git a/README.md b/README.md
index b66c678..4aebd01 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,5 @@
 
  Koan 1 : 
  
-  - add a css file that make header green and content red
+ - add a css file that make header green and content red
+ - use diplay flex to make content fill the entire page