diff --git a/README.md b/README.md
index 53a9628..b878c8a 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 levelSync is a spigot plugin which help you to synchronize minecraft vanilla experience between yours servers using MySQL.
 
+__IMPORTANT:__ This plugin do no support player in offline mode, please enable online-mode on bungeecord
+
 # Installation
 
 - Put the .jar file in your spigot (not bungeecord) plugin folder