diff --git a/docs/tutorial/chat2.md b/docs/tutorial/chat2.md
index a4c347087..37be9c636 100644
--- a/docs/tutorial/chat2.md
+++ b/docs/tutorial/chat2.md
@@ -68,4 +68,18 @@ This will bypass the random peer selection process and connect to the specified
 | --- | --- |
 | `/help` | displays available in-chat commands |
 | `/connect` | interactively connect to a new peer |
-| `/nick` | change nickname for current chat session |
\ No newline at end of file
+| `/nick` | change nickname for current chat session |
+
+## `chat2` message protobuf format
+
+Each `chat2` message is encoded as follows
+
+```protobuf
+message Chat2Message {
+  uint64 timestamp = 1;
+  string nick = 2;
+  bytes payload = 3;
+}
+```
+
+where `timestamp` is the Unix timestamp of the message, `nick` is the relevant `chat2` user's selected nickname and `payload` is the actual chat message being sent. The `payload` is the byte array representation of a UTF8 encoded string.