diff --git a/README.md b/README.md
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+++ b/README.md
@@ -2,6 +2,9 @@
 
 A Chrome extension for quickly capturing and organizing URLs into Semble Collections using your Bluesky account.
 
+> [!WARNING]
+> This extension currently only supports accounts hosted by **Bluesky**
+
 ## About
 
 Save interesting web pages directly into your Semble Collections. Simply click the extension icon, add an optional note, select a collection, and save—all without leaving your current page.