diff --git a/README.md b/README.md
index 022eb58..f188237 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,15 @@ Use some bootloaders files provide by :
 
 ### Configuration files
 
+Contains the files which defines the PXE menu. The [first one][main menu.cfg] will :
+  * Call all others menu.cfg from subdirectories (debian/, clonezilla/,…) as an entry.
+  * Define a timeout (4 seconds).
+  * Define the default entry (boot on local first disk).
+  * …
+
+#### config/debian/menu.cfg
+
+
 ### Preseed
 
 ### Scripts
@@ -53,4 +62,5 @@ See the [scripts's README.md][scripts readme.md] file for more informations.
 
 
 
+[main menu.cfg]: ./config/menu.cfg
 [scripts readme.md]: https://git.ipr.univ-rennes1.fr/cellinfo/tftpboot/src/master/scripts "scripts's README.md for tftpboot"