diff --git a/json/members.json b/json/members.json
index ce619474..ef5432a0 100644
--- a/json/members.json
+++ b/json/members.json
@@ -361,7 +361,7 @@
   ],
   [
     "横山 健",
-    "YOKOYAMA, Takeshi",
+    "YOKOYAMA, Takeshi, PhD",
     "202310_yokoyama.jpeg",
     "学術支援技術専門員",
     "Project Senior Technical Support Specialist",