diff --git a/Mailbox-Properties-Client.md b/Mailbox-Properties-Client.md
index 0ebbe9a..cc0482c 100644
--- a/Mailbox-Properties-Client.md
+++ b/Mailbox-Properties-Client.md
@@ -13,9 +13,9 @@ The client uses a separate BSP group for communicating with each contact. The [g
 
 ### Message types
 
-**UPDATE** - The message body is a BDF list with two elements: `version` (int), and `properties` (dictionary). `version` is incremented whenever the properties change. The keys of the dictionary are strings.
+**UPDATE** - The message body is a BDF list with two elements: `version` (int), and `properties` (dictionary). `version` is incremented whenever the properties change. The keys of the `properties` dictionary are strings.
 
-For major version 0, the dictionary of a well-formed update is either empty, which means for the receiver that there is no mailbox available for use. Or it contains precisely 4 items:
+For major version 0, the `properties` of a well-formed update are either 0 (empty dict), which means for the receiver that there is no mailbox available. Or, there are precisely 4 items:
 
 * "onionPubKey" : byte[32]
 * "token"       : byte[32]