From 5fea05bc5fbf697d9a4dae1dfcff79e5c045f43d Mon Sep 17 00:00:00 2001
From: Andrey Antukh <niwi@niwi.nz>
Date: Tue, 7 Jan 2020 23:03:19 +0100
Subject: [PATCH] :books: Update doc.

---
 docs/99-Collaborative-Edition.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs/99-Collaborative-Edition.md b/docs/99-Collaborative-Edition.md
index 3b05c4eed..314e5eb4f 100644
--- a/docs/99-Collaborative-Edition.md
+++ b/docs/99-Collaborative-Edition.md
@@ -51,6 +51,14 @@ Will cause:
 - A posible `:page-changes`.
 - Broadcast `:joined` message to all users of the file.
 
+The `joined` message has this aspect:
+
+```clojure
+{:type :joined
+ :page-id <id>
+ :user-id <id>
+ }
+```
 
 ### `who` ###