diff --git a/guide/intro.md b/guide/intro.md
index 8a54374..6fe3955 100644
--- a/guide/intro.md
+++ b/guide/intro.md
@@ -25,11 +25,14 @@ What it doesn't specify:
 - Multi device/app support from the start. Every device/app has its own keypair. They're connected together into one identity using an Account tangle. The Account tangle's root message ID is the account's identifier.
 - One account or even keypair can post messages concurrently (forking) without problem. Because there aren't linear feeds, everything is in tangles.
 - Deletion is possible. The data contents of a message is separate from the message metadata, and only the metadata + hash of the data is signed.
+- When messages are getting signed they get serialized according to [RFC 8785](https://tools.ietf.org/html/rfc8785).
+- Easy to use invites
 
 ### How PZP is different from Nostr
 
 - keys are not shared across devices
 - sig-chains - you know if you're missing content in PZP
+- trust based - invite only
 
 ## Tangles