diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -41,7 +41,14 @@ Example :
 
 - **Run ./admin_show_desktop.sh** to launch xfce4
 - **Disable screen saver**, go to Application > Settings > Screensaver
-  - Otherwise, the screensaver activates and you won't be able to open a x11 session
+  - Otherwise, the screensaver activates and you won't be able to connect with VNC.
+  
+### Optional : set server wallpaper to identify the server
+
+- Under **/home/rf2User/Pictures** 
+  - you have a few wallpapers with numbers you can use to tag server background
+![Provided wallpaper](./docs/assets/screenshot_wallpapers.png)
+- **Right click** on a picture > **Set as wall paper**
 
 ## Building the image
 
diff --git a/docs/assets/screenshot_wallpapers.png b/docs/assets/screenshot_wallpapers.png
new file mode 100644
index 0000000..f6fb9d1
Binary files /dev/null and b/docs/assets/screenshot_wallpapers.png differ