diff --git a/docs/README.md b/docs/README.md
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@@ -1,3 +1,6 @@
+> [!CAUTION]
+> this application is under active development and it is not recommended to use yet.
+
 # mca selector lite
 A from-scratch rewrite of [mcaselector](https://github.com/Querz/mcaselector) in C.