diff --git a/Algo/CM/CM du 27 septembre.md b/Algo/CM/CM du 27 septembre.md
index dc93d2d..50ea077 100644
--- a/Algo/CM/CM du 27 septembre.md	
+++ b/Algo/CM/CM du 27 septembre.md	
@@ -22,4 +22,7 @@
 		- ``insert: list x integer x element -> list``
 		- ``insert(l, i, e)``
 		- return a result of type `list`
+	- We can use the `_`to pass an argument without parentheses
+		- `facotrial: interger -> integer`= `_!: interger -> integer`
+		- `power: integer x integer -> integer`= `_^_: integer x integer -> integer`
 	- 
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