diff --git a/MessagingApp.markdown b/MessagingApp.markdown
index 531ce8b..791ffaa 100644
--- a/MessagingApp.markdown
+++ b/MessagingApp.markdown
@@ -7,7 +7,7 @@ MessagingApp has a single channel with the following random identifier:
 
 ### Message types
 
-**0: PRIVATE_MESSAGE** - The content is a [BDF](BDF) list with two elements: `body` (string) and `attachments` (dictionary, may be null). Each key in `attachments` is the name of an attachment, and the value is a list with two elements: `mime_type` (string) and `message_id` (raw, HASH_LEN bytes).
+**0: PRIVATE_MESSAGE** - The content is a [BDF](BDF) list with two elements: `body` (string) and `attachments` (dictionary, may be null). Each key in `attachments` is the name of an attachment, and the value is a list with two elements: `mime_type` (string) and `message_id` (raw).
 
 **1: ATTACHMENT** - The content is raw data.