diff --git a/README.md b/README.md
index a35a0d1..c24870a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # rebterlai
 
-lo rebterlai
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+lo rebterlai
+
+# THIS IS NOT OFFICIAL TAILSCALE SOFTWARE
+
+I am reverse-engineering it from the open source code because I am bored.
+
+# DO NOT USE THIS IN PRODUCTION
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