diff --git a/Transport-Properties-Client.md b/Transport-Properties-Client.md
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+The transport properties client is a [BSP client](BSP) that synchronises transport properties between pairs of devices. Transport properties describe how to connect to a device over various transports.
+
+### Group identifiers
+
+The client's identifier is `org.briarproject.bramble.transport`.
+
+The client uses a separate group for each pair of contacts. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
+
+The client also uses a group with an empty descriptor for storing local transport properties. This group is not shared with any contacts.
+
+### Message types
+
+**UPDATE** - The message body is a BDF list with three elements: `transportId` (string), `version` (int), and `properties` (dictionary). `transportId` and `properties` are supplied by the transport plugin. `version` is incremented whenever the properties change.
+
+### Validity policy
+
+* An update is valid if it is well-formed.
+
+### Storage policy
+
+* In the groups shared with contacts:
+    * For each transport, the local message with the highest version is stored.
+    * For each transport, the remote message with the highest version is stored.
+* In the unshared group, the local message with the highest version is stored.
+
+### Sharing policy
+
+* In the groups shared with contacts, all local messages are shared.
+* In the unshared group, no messages are shared.
diff --git a/TransportClient.md b/TransportClient.md
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-TransportClient is a [BSP client](BSP) that synchronises transport properties between devices. Transport properties describe how to connect to a device over various transports.
-
-### Group identifiers
-
-TransportClient uses the following client identifer:   
-`673e a091 6735 61e2 8f70 122f 6a8e a8f4 97c3 624b 86fa 07f7 85bb 15f0 9fb8 7b4b`
-
-The client uses a separate group for each pair of contacts. The [group descriptor](BSP#group-identifiers) is a [BDF list](BDF) containing the unique IDs of the contacts' identities, sorted in ascending order as byte strings.
-
-### Message types
-
-**0: UPDATE** - The content is a BDF list with three elements: `transport_id` (string), `properties` (dictionary), and `version` (int). `transport_id` and `properties` are supplied by the transport plugin. `version` is incremented whenever the properties change.
-
-### Validity policy
-
-* An update is valid if it is well-formed.
-
-### Storage policy
-
-* For each transport, the local message with the highest version is stored.
-* For each transport, the remote message with the highest version is stored.
-
-### Sharing policy
-
-* All local messages are shared.
-* All remote messages are shared.