diff --git a/Home.md b/Home.md
index 9da3e07..09ba60c 100644
--- a/Home.md
+++ b/Home.md
@@ -8,6 +8,8 @@ explaining the file `*.elmt` and then `*.qet`
 and this for developers.
 
 ## [elements XML structure](elements_XML)
+Note: the elements file contains 1 element. (this may change in the future)
+## [project XML structure](project_XML)
 
 ## [contributor to wiki](contributor_to_wiki_guidelines)
 
diff --git a/_Sidebar.md b/_Sidebar.md
index c1b52f7..48c8e29 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -9,5 +9,5 @@
          *  [description](elements_child_description)
          *  [kindInformations](elements_child_kindInformations)
          *  [elementInformations](elements_child_elementInformations) 
- *   [XML-diagram](diagram_XML)
+ *   [XML-project](project_XML)
  *   [contributor to wiki guidelines](contributor_to_wiki_guidelines)
diff --git a/data_files/project_XML.md b/data_files/project_XML.md
new file mode 100644
index 0000000..1f88dbc
--- /dev/null
+++ b/data_files/project_XML.md
@@ -0,0 +1,21 @@
+# The XML structure used to describe the project in QElectroTech 0.8
+
+Or the XML project creator guide. This page aims to describe the XML structure used to store the diagram and the elements used in QElectroTech. It is aimed at QET developers but also at non-developers.
+
+
+## project
+ **is a root element**
+
+Example:
+`<project version="0.80" title="my_title">`
+
+### attribute
+ *  version : QET::version
+ *  title :
+
+### child elements
+ *  [properties](project_child_properties)
+ *  [newdiagrams](project_child_newdiagrams)
+ *  [diagram](project_child_diagram)
+ *  [collection](project_child_collection)
+