diff --git a/content/docs/nav.yml b/content/docs/nav.yml
index aa3bcf924..fd591789c 100644
--- a/content/docs/nav.yml
+++ b/content/docs/nav.yml
@@ -130,7 +130,7 @@
   - id: codebase-overview
     title: コードベースの概要
   - id: implementation-notes
-    title: Implementation Notes
+    title: 実装に関するメモ
   - id: design-principles
     title: 設計原則
 - title: FAQ