diff --git a/101.md b/101.md
index 94ccc91..3768cca 100644
--- a/101.md
+++ b/101.md
@@ -27,7 +27,16 @@ The protocol can be implemented following the steps below. Note that the content
 
 1. User A (the initiator) generates an alias key pair derived from their own private key and User B's (the recipient) public key.
 
-2. User A sends a 10100 kind event to User B, signed with their alias private key. The 'p' parameter is User B's real pubkey. The `encrypted_text` can be in json format: `{"p":"A's real pubkey", "content":"your content"}`.
+2. User A sends a 10100 kind event to User B, signed with their alias private key. The 'p' parameter is User B's real pubkey. The `encrypted_text` can be in json format: 
+
+
+```json
+{
+	"p":"A's real pubkey",
+	"content":"your content", 
+	"sig":"<64-bytes hex of the signature of the event id, signed by A's real private key>"
+}
+```
 
 For example: