diff --git a/src/common/assets/main-menu.json b/src/common/assets/main-menu.json
index d9bb3fe..aecb24c 100644
--- a/src/common/assets/main-menu.json
+++ b/src/common/assets/main-menu.json
@@ -5,7 +5,7 @@
     },
     {
         "title": "[en]About \"Dynamic Brain\"[/en][ja]\"Dynamic Brain\"とは[/ja]",
-        "link": "/documents/index.php?content_id=14"
+        "link": "/documents/concept.html"
     },
     {
         "title": "[en]Articles[/en][ja]特集記事[/ja]",