Index: README.md
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--- README.md	(revision 7008b282651eea7f9bca1a9af37439b6f4c3f48b)
+++ README.md	(revision c0e00a2f06b73a95a1762a13537457029d52ba06)
@@ -32,4 +32,8 @@
 platform (PaaS)**. **Not** on classic shared PHP hosting. The database (SQLite)
 creates itself on first start.
+
+> **Requires [Node.js](https://nodejs.org/) 20 or newer.** The one-command VPS
+> installer and the Docker image include it; only a manual install needs you to
+> provide it.
 
 ### Option A — One-command VPS installer (recommended)