diff --git a/ChangeLog b/ChangeLog
index 871888c04df..90ca2bfc1a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -39,6 +39,11 @@ For developers:
 - Qual: Mutualize code of menu managers.
 - Better isolation of modules files and dolibarr core files. 
 
+WARNING: A lot of class files (*.class.php) has moved into subdirectories. So If you use
+ or develop non official modules that includes Dolibarr classes, you will have to rename
+ path to thoose classes into the include function.
+   
+
 
 ***** ChangeLog for 2.8.1 compared to 2.8 *****
 For users: