diff --git a/MessagingClient.markdown b/MessagingClient.markdown
index f96025f..744ea8e 100644
--- a/MessagingClient.markdown
+++ b/MessagingClient.markdown
@@ -2,9 +2,11 @@ MessagingClient is a [BSP client](BSP) that synchronises private messages betwee
 
 ### Channel identifiers
 
-MessagingClient has a single channel with the following random identifier:   
+MessagingClient uses the following client identifier:   
 `6bcd c006 c091 0b0f 44e4 0644 c3b3 1f1a 8bf9 a6d6 021d 40d2 19c8 6b73 1b90 3070`
 
+The client uses a single channel for all messages. The [client data structure](BSP#channel-identifiers) for the channel is a [BDF list](BDF) with a single element: "PRIVATE_MESSAGE" (string).
+
 ### 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).