diff --git a/README.md b/README.md
index f0144c7..0c5d7e2 100644
--- a/README.md
+++ b/README.md
@@ -33,9 +33,18 @@ Desired:
 - Transport privacy (Whisper, etc)
 - Payload and messages
 
-x4-x8 is Oskar cutting things up into orthogonal pieces.
-
+(x4-x8 is Oskar cutting things up into orthogonal pieces.)
 
 ## Incubation
 
 Things that are being researched and might show up as SIP in the future. See [Big Brother protocol](https://github.com/status-im/bigbrother-specs/).
+
+x9 upcoming: Minimal Viable Data Sync, which will provide reliable data sync between clients, only relying on best-effort delivery. More on requirements here: https://github.com/status-im/specs/
+
+Later:
+- Whisper better bandwidth (topic partition)
+- Specific payloads for SNT use cases
+- MLS
+- PSS
+- Mixnet
+- Etc
diff --git a/x4.md b/x4.md
index bc1f4b3..eb044d2 100644
--- a/x4.md
+++ b/x4.md
@@ -365,3 +365,26 @@ All described addons are implemented in [status-im/whisper fork](https://github.
 ## New RPC methods
 
 TODO: provide a list of RPC methods from `shhext` API which are relevant to this spec.
+
+
+## Raw SoK TODO leftovers
+
+## Misc notes
+
+### Factors not captured
+- Censorship-resistance, DPI etc
+- Continuance of protocol
+- Availability/Robustness e.g. FW port blocking
+- p2p no central source of control
+- trust minimized
+- Open machine readable specification
+- multiple implementaions
+- group chat performance
+- mobile specific / churnable
+
+### TODO: Later, for each property have
+- Current protocl
+- How we use it
+- Future considerations
+- Desired by Status
+- The ethereum txn viewpoint
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