diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
 ### Map generator for "BE Graphes"
 
+The purpose of this repository is to ease the process of generating graph and mapforge file that are consistent (using the same OpenStreetMap data).
+
+### How to start?
+
 To clone this repository:
 
 ```bash