diff --git a/README.md b/README.md
index d10b037..b08c0ff 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ The following SIPs are under consideration for standardization.
 - [Status Payload Specification](status-payloads-spec.md). What the message payloads look like.
 - [Status Account Specification](status-account-spec.md). What a Status account is and how trust is established.
 - [Status Whisper Usage Specification](status-whisper-usage-spec.md). How we use Whisper to do routing, metadata protection and provide 1:1/group/public chat.
+- [Status Whisper Mailserver Specification](status-whisper-mailserver-spec.md). How we use Whisper mailservers to provide offline inboxing.
+
 
 ## Protocol Research