diff --git a/website/static/index.html b/website/static/index.html
index 52fa03f..4f31b53 100644
--- a/website/static/index.html
+++ b/website/static/index.html
@@ -21,6 +21,7 @@
   <meta name="twitter:title" content="VisionFlow: Coordination Engineering" />
   <meta name="twitter:description" content="Federated coordination, self-sovereign data, formal reasoning, cryptographic provenance, human-in-the-loop governance." />
   <meta name="twitter:image" content="https://www.visionflow.info/img/og-card.png" />
+  <meta name="twitter:image:alt" content="VisionFlow coordination harness — live knowledge-graph visualisation." />
   <link rel="canonical" href="https://www.visionflow.info" />
   <link rel="preconnect" href="https://fonts.googleapis.com" />
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />