Update index.md

Reputeless · Reputeless · commit 18182f663979 · 2026-01-22T10:38:38.000+09:00
diff --git a/docs/index.md b/docs/index.md
@@ -36,6 +36,7 @@ C++17, C++20, C++23, C++26 に関する情報を調査・提供します。
 #### Gold Sponsor 
 - [TOMOAKI12345](https://github.com/TOMOAKI12345){:target="_blank"}
 - [CubeSoft, Inc.](https://www.cube-soft.jp/){:target="_blank"}
+- [おおやま](https://www.ise.ous.ac.jp/laboratory/t-oyama.html){:target="_blank"}
 
 #### Silver Sponsor
 - [sknjpn](https://x.com/sknjpn){:target="_blank"}
@@ -44,4 +45,4 @@ C++17, C++20, C++23, C++26 に関する情報を調査・提供します。
 - [kt2763](https://github.com/kt2763){:target="_blank"}
 
 #### Bronze Sponsor
-アゲハマ, Fuyutsubaki, 😊, 🐝, jacking75, Chris Ohk, ysaito, おおやま, ShivAlley, lamuda, fal_rnd, As Project, IZUNA, nasatame, sashi, 🌶️, PlumRice, 緑獺おがめ
+アゲハマ, Fuyutsubaki, 😊, 🐝, jacking75, Chris Ohk, ysaito, ShivAlley, lamuda, fal_rnd, As Project, IZUNA, nasatame, sashi, 🌶️, PlumRice, 緑獺おがめ
