diff --git a/Feature-Matrix.md b/Feature-Matrix.md
index 8636249..a740503 100644
--- a/Feature-Matrix.md
+++ b/Feature-Matrix.md
@@ -25,7 +25,7 @@
 | >   sendEndSessionMessage           | ✅ | ✅ | ✅
 | >   sendMessage                     | ✅ | ✅ | ✅
 | >   sendMessageWithAttachments      | ✅ | ❔ | ✅
-| >   send URL as attachment          | ❌ | ❌ | ✅
+| >   send URL as attachment          | ❌ | ❌ | ✅<sup>1</sup>
 | >   sendGroupMessage                | ✅ | ✅ | ✅
 | >   sendNoteToSelfMessage           | ✅ | ✅ | ✅
 | >   expiresInSeconds                | ❌ | ❌ | ❌
@@ -96,3 +96,5 @@
 | isMember                           | ❌ | ❌ | ✅
 | isRegistered                       | ❌ | ❌ | ✅
 
+# Notes
+1. Proposed <https://github.com/johnfreed/signal-cli>
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