diff --git a/README.md b/README.md
index cacf9bf..b472441 100644
--- a/README.md
+++ b/README.md
@@ -437,10 +437,8 @@ See `vendor/ruvector/` for full source.
 
 ---
 
-## 🏗️ System Architecture
-
 <details>
-<summary><strong>End-to-end data flow</strong> — From CSI capture to REST/WebSocket API</summary>
+<summary><strong>🏗️ System Architecture</strong> — End-to-end data flow from CSI capture to REST/WebSocket API</summary>
 
 ```
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