diff --git a/docs/index.md b/docs/index.md
index 72b517d..d31eb01 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -31,7 +31,7 @@ We model the LLM workflow as a **Nested Flow**:
 ## Preparation
 
 - [LLM Wrapper](./llm.md)
-- Tools
+- [Tool](./tool.md)
 
 ## Paradigm Implementation