diff --git a/docs/.nav.yml b/docs/.nav.yml
index 7bada971c6..bc4a003818 100644
--- a/docs/.nav.yml
+++ b/docs/.nav.yml
@@ -33,7 +33,6 @@ nav:
     - design/architecture_overview.md
     - design/vllm_omni_design.md
     - design/mrs_design.md
-    - design/api_design_doc.md
   - Docs Guide: contributing/DOCS_GUIDE.md
 - API Reference:
   - api/README.md
diff --git a/docs/design/index.md b/docs/design/index.md
index aefefa0c84..d0393f2a76 100644
--- a/docs/design/index.md
+++ b/docs/design/index.md
@@ -7,7 +7,3 @@ This section contains design documents and architecture specifications for vLLM-
 - [Architecture Overview](architecture_overview.md)
 - [vLLM-Omni Software Design Document](vllm_omni_design.md)
 - [Multi-Request Streaming](mrs_design.md)
-
-## API Design Documentation
-
-- [vLLM-Omni API Design Documentation](api_design_doc.md)