diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,8 @@
+# WARNING: THIS IS SUPER MEGA EXTRA ALPHA VERSION OF DATABASE/SQL DRIVER FOR YDB!!!
+# Don't use it in production environment!
+
+If you ok with this warning, then...
+
 # Building YDB C++ SDK from sources
 
 ## Prerequisites