diff --git a/2023/orb/presentation.html b/2023/orb/presentation.html
index 2fe4138..8ab824d 100644
--- a/2023/orb/presentation.html
+++ b/2023/orb/presentation.html
@@ -165,7 +165,10 @@ <h1 id="fast-first-response-1">Fast First Response</h1>
 <hr>
 <h1 id="なぜ">なぜ?</h1>
 <ul>
-<li>スタジアムモデル[^working in public]</li>
+<li>スタジアムモデル[^working in public]<ul>
+<li>Contributorは少数で、ユーザーが膨大な状態</li>
+</ul>
+</li>
 <li>多くのプロダクトはユーザーは増えても、Contributorは線形には増えない</li>
 </ul>
 <p><img alt="スタジアムモデル" src="image.png"></p>
diff --git a/2023/orb/presentation.md b/2023/orb/presentation.md
index 4b1a8d3..bae4480 100644
--- a/2023/orb/presentation.md
+++ b/2023/orb/presentation.md
@@ -112,6 +112,7 @@ autoscale:true
 # なぜ?
 
 - スタジアムモデル[^working in public]
+    - Contributorは少数で、ユーザーが膨大な状態
 - 多くのプロダクトはユーザーは増えても、Contributorは線形には増えない
 
 ![スタジアムモデル](image.png)
diff --git a/2023/orb/presentation.pdf b/2023/orb/presentation.pdf
index 8215f4f..162003b 100644
Binary files a/2023/orb/presentation.pdf and b/2023/orb/presentation.pdf differ