diff --git a/mkdocs.yml b/mkdocs.yml
index ff9ad760a6601f73b80d451d6c34c86c975647d0..f1f151d5a7e38544bfa444e5079a87e7232fd012 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -137,8 +137,9 @@ nav:
       - Message bus: ./architecture/messagebus.md
       - OSOM: ./architecture/osom.md
       - Authentication: ./architecture/oauth.md
-      - TMF API: ./architecture/tmfapi.md
-      - NFV API: ./architecture/nfvapi.md
+      - APIs:
+        - TMF API: ./architecture/tmfapi.md
+        - NFV API: ./architecture/nfvapi.md
       - TMF WEB: ./architecture/tmfweb.md
       - NFV WEB: ./architecture/nfvweb.md
       - Issue management: ./architecture/issuemgt.md