diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 3c384ef..0f62cd3 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -159,12 +159,12 @@
   "active": "0d2d422aa24bb900",
   "lastOpenFiles": [
     "Algo/Séminaire/Introduction.md",
+    "Algo/Séminaire/Exercices seminaire.md",
     "Algo/Séminaire/Chapter 5 - Recursivity.md",
     "Algo/Séminaire/Chapter 3 - Case analysis.md",
     "Algo/Séminaire/Chapter 2 - Functions.md",
     "Algo/Séminaire/Chapter 4 - A bit of imperative.md",
     "Algo/Séminaire/Chapter 1 - CAML basics.md",
-    "Algo/Séminaire/Exercices seminaire.md",
     "Algo/Séminaire/assets/exception-meme.png",
     "Algo/Séminaire/assets/filter-meme.png",
     "Algo/Séminaire/assets/if-meme.png",
diff --git a/Algo/Séminaire/Chapter 5 - Recursivity.md b/Algo/Séminaire/Chapter 5 - Recursivity.md
index 8bb8f55..229b6bd 100644
--- a/Algo/Séminaire/Chapter 5 - Recursivity.md	
+++ b/Algo/Séminaire/Chapter 5 - Recursivity.md	
@@ -94,3 +94,11 @@ val add : int -> bool = <fun>
 val even : int -> bool = <fun>
 ```
 
+An accumulator is a thing that try to get our result. In CAML we trying to not use an accumulator in our program. In CAML the syntax for the accumulator (`inv`) is: (exemple with reverse_int exercise. See 4.9 - b)
+```Ocaml
+# let reverse_int =
+	let rec rev inv = function
+		| 0 -> inv
+		| n -> rev (inv*10 + n mod 10)(n/10)
+	in rev 0 n;;
+```
diff --git a/Algo/Séminaire/Exercices seminaire.md b/Algo/Séminaire/Exercices seminaire.md
index c0006f1..6d881fe 100644
--- a/Algo/Séminaire/Exercices seminaire.md	
+++ b/Algo/Séminaire/Exercices seminaire.md	
@@ -339,12 +339,10 @@ let rec reverse_int n =
 val reverse : int -> string = <fun>
 
 # let reverse_int =
-	let rec rev org new_ =
-		if org < 10 then
-			new_ * 10 + org
-		else
-			rev (org/10)(new*10 + org mod 10)
-	in rev n 0;;
+	let rec rev inv = function
+		| 0 -> inv
+		| n -> rev (inv*10 + n mod 10)(n/10)
+	in rev 0 n;;
 ```
 
 ## Exercise 4.10