diff --git a/README.md b/README.md
index 1c9d03dd..88343674 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 OptunaHub Registry
 ==================
 
+__NOTICE: OptunaHub Registry is currently under preparation. We do not accept requests for package registration from the general public.__
+
 # List of Packages
 
 ## Samplers