diff --git a/mkdocs.yml b/mkdocs.yml
index d38fc7e0..d63dbc20 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -198,7 +198,7 @@ nav:
     - Upgrade notes for 11.0.x: upgrade/upgrade_notes_for_11.0.x.md
     - Upgrade notes for 10.0.x: upgrade/upgrade_notes_for_10.0.x.md
     - Upgrade notes for 9.0.x: upgrade/upgrade_notes_for_9.0.x.md
-    - Summary of Seafile Obsolete Configurations: upgrade/seafile_obsolete_configurations.md
+    - Summary of obsolete configurations: upgrade/seafile_obsolete_configurations.md
   - Developing:
     - Outline: develop/README.md
     - How to Build Seafile: