improve changelog slightly

CHANGES.rst

@@ -5,16 +5,18 @@ Webclient:
 
 Changes in synpase 0.4.0 (2014-10-17)
 =====================================
-This server includes changes to the federation protocol that is not backwards
-compatible.
+This release includes changes to the federation protocol and client-server API
+that is not backwards compatible.
 
-The Matrix specification has been moved to a separate git repository.
+The Matrix specification has been moved to a separate git repository:
+http://github.com/matrix-org/matrix-doc
 
 You will also need an updated syutil and config. See UPGRADES.rst.
 
 Homeserver:
- * Sign federation transactions.
- * Rename timestamp keys in PDUs.
+ * Sign federation transactions to assert strong identity over federation.
+ * Rename timestamp keys in PDUs and events from 'ts' and 'hsob_ts' to 'origin_server_ts'.
+
 
 Changes in synapse 0.3.4 (2014-09-25)
 =====================================