diff --git a/README.md b/README.md
index d012756..0d1081a 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,26 @@ script which permit to launch easily some virtual machines via qemu
 
 - <u>qemu</u> full installation
 
+## Functionnality:
+
+- create a config file to stores options for a vm [~]
+- start a vm while reading for the conf file [ok]
+- create a vm with the ability to choose an iso disk to launch the vm [ok]
+- del all sata related to a vm [~ok] (misses deleted conf file)
+- create a backup or being able to recall the bacup [ok] (can be improved)
+- start directly the backup file [ok]
+- can create only the conf file instead of starting/creating vm [ok]
+- list all vm already created [ok]
+- print help of version number [ok]
+- support option nproc to launch the vm with a different number of proc than precised in the config file [ok]
+- same for option memory [ok]
+- same for option size, size is only usefull when creating a vm [ok]
+- can support launching vm in uefi mode [ok] (doesn't fully support the UEFI in conf mode, preffer use the option uefi while launching vm.)
+- can add customs options to a vm [ok]
+- take option create_disk to know what disk to use when creating a vm. [ok]
+
+
+
 ## Usage:
 
 ### to get some help;