diff --git a/protospec.md b/protospec.md
index dd6ae9f..4d4c0e7 100644
--- a/protospec.md
+++ b/protospec.md
@@ -1,5 +1,7 @@
 # Msg V2
 
+Background: https://github.com/ssbc/ssb2-discussion-forum/issues/24
+
 ## Terminology
 
 - **Msg** = published data that is signed and shareable