diff --git a/docs/index.md b/docs/index.md
index 1181c17..2d236dc 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -2,7 +2,9 @@
 
 This book serves as a comprehensive resource on BrainKB, offering detailed information about its guiding principles, architecture, service components, and the various tools and libraries developed for it. Additionally, it functions as technical documentation, providing instructions for deploying BrainKB services and user interface (UI) components.
 
-**Status:** In progress.
+```{warning}
+This document is currently under development. The content is expected to undergo modifications without prior notification.
+```
 
 ```{important}
 This book is also expected to replace the [BrainKB design document](https://github.com/sensein/brainkb-design-document/tree/design-doc).