diff --git a/README.md b/README.md
index 72fc61b..b90a17c 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@
 mozDefrag
 =========
 
+WARNING : this is a first release of an Alpha version
+
 Firefox and Thunderbird are using SQLite databases, which can make these apps slower and slower after a while.
 The purpose of this app is to optimize every SQLite databases used by these apps in a simple click.