PR review.

draft-ietf-ppm-dap.md

@@ -152,24 +152,28 @@ input is ever seen in the clear by any aggregator.
 
 12:
 
-- Bump draft-irtf-cfrg-vdaf-08 to 12 {{!VDAF}}. (\*)
+- Bump draft-irtf-cfrg-vdaf-08 to 12 {{!VDAF}}, and specify the newly-defined
+  application context string to be a concatenation of the DAP version in use
+  with the task ID. (\*)
 
 - Add support for "asynchronous" aggregation, based on the Leader polling the
-  Helper for completion. (\*)
+  Helper for the result of each step of aggregation. (\*)
 
 - Update collection semantics to match the new aggregation semantics introduced
   in support of asynchronous aggregation. (\*)
 
-- Clarify the requirements around report replay protection.
+- Clarify the requirements around report replay protection, defining when and
+  how report IDs must be checked and stored in order to correctly detect
+  replays.
 
 - Remove the `max_batch_size` parameter of the fixed-size query type.
 
-- Rename the "fixed-size" query type to "leader-selected", to align the name
-  with the behavior of this query type.
-
 - Rename "query type" to "batch mode", to align the name of this configuration
   value with its functionality.
 
+- Rename the "fixed-size" batch mode to "leader-selected", to align the name
+  with the behavior of this query type.
+
 - Restore the `part_batch_selector` field of the `Collection` structure, which
   was removed in draft 11, as it is required to decrypt collection results in
   some cases. (\*)