diff --git a/Algo/Séminaire/Chapter 3 - Case analysis.md b/Algo/Séminaire/Chapter 3 - Case analysis.md
index d6dffa6..d6a71e8 100644
--- a/Algo/Séminaire/Chapter 3 - Case analysis.md	
+++ b/Algo/Séminaire/Chapter 3 - Case analysis.md	
@@ -10,9 +10,11 @@ if cond then expr1 else expr2
 ```Ocaml
 # if 1<2 then "higher" else "lower" ;;
 -: string = "higher"
+```
 
+**Exercise : absolute program**
+```Ocaml
 # let abs(x) = 
 	if x>0 then x
 	else -x ;;;
-
 ```