diff --git a/docs/_Sidebar.md b/docs/_Sidebar.md
index e4fce4b..f31b9f9 100644
--- a/docs/_Sidebar.md
+++ b/docs/_Sidebar.md
@@ -5,3 +5,4 @@
 - Requirements: [[EN|0-requirements]] / [[JA|0-requirements.ja]]
 - Memory Philosophy: [[EN|1-memory-philosophy]] / [[JA|1-memory-philosophy.ja]]
 - Feedback Memory: [[EN|2-feedback-memory]] / [[JA|2-feedback-memory.ja]]
+- Unresolved Source Investigation: [[JA|3-unresolved-source-investigation.ja]]