diff --git a/Specs-and-RFCs-used.md b/Specs-and-RFCs-used.md
index 6c60e152..84c91809 100644
--- a/Specs-and-RFCs-used.md
+++ b/Specs-and-RFCs-used.md
@@ -1,6 +1,14 @@
 Specs and RFCs used
 ===================
 
+* [ActivityPub](https://www.w3.org/TR/activitypub/)  
+  Federation protocol
+* [WebFinger](https://tools.ietf.org/html/rfc7033)  
+  User-on-domain lookups
+* [HTTP Signatures](https://tools.ietf.org/html/draft-cavage-http-signatures-06)  
+  Server-to-server authentication of requests
+* [Linked Data Signatures](https://w3c-dvcg.github.io/ld-signatures/)
+  Server-to-server authentication of forwarded payloads
 * [OStatus](https://www.w3.org/community/ostatus/wiki/images/9/93/OStatus_1.0_Draft_2.pdf)  
   Suite of federation protocols
   * [Salmon](http://www.salmon-protocol.org/salmon-protocol-summary)  
@@ -15,9 +23,3 @@ Specs and RFCs used
     Encoding chains of conversations
   * [WebSub](https://pubsubhubbub.github.io/PubSubHubbub/pubsubhubbub-core-0.4.html) (formerly PubSubHubbub)  
     Broadcasting of real-time updates to followers
-* [WebFinger](https://tools.ietf.org/html/rfc7033)  
-  User-on-domain lookups
-* [HTTP Signatures](https://tools.ietf.org/html/draft-cavage-http-signatures-06)  
-  Server-to-server authentication of requests
-* [ActivityPub](https://www.w3.org/TR/activitypub/)  
-  Federation protocol