diff --git a/README.md b/README.md
index f164c68..d55203a 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,11 @@ Table of contents
    * [Git push](#git-push)
 <!--te-->
 
+NOTA BENE
+=================
+I've tested the playbooks mainly on Debian 9 and ubuntu (server) 18.04 LTS,
+I've started converting the roles to distinguish between OSes but it's incomplete.
+
 
 Prerequisites
 =============