diff --git a/README.md b/README.md
index 948453b..d7ae9cc 100644
--- a/README.md
+++ b/README.md
@@ -5,4 +5,5 @@ The objective of these exercices is to become more confortable with css manipula
 ![graphical instructions](./css-koans-training.png)
 
  - add a css file that make header green and content red
- - use diplay flex to make content fill the entire page 
+ - use diplay flex to make content fill the entire page
+ - add a 25% width left sidebar