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-rw-r--r--synapse/storage/schema/__init__.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/storage/schema/__init__.py b/synapse/storage/schema/__init__.py
index 20c344faea..da98f05e03 100644
--- a/synapse/storage/schema/__init__.py
+++ b/synapse/storage/schema/__init__.py
@@ -61,7 +61,9 @@ Changes in SCHEMA_VERSION = 68:
 
 Changes in SCHEMA_VERSION = 69:
     - We now write to `device_lists_changes_in_room` table.
-    - Use sequence to generate future `application_services_txns.txn_id`s
+    - We now use a PostgreSQL sequence to generate future txn_ids for
+      `application_services_txns`. `application_services_state.last_txn` is no longer
+      updated.
 
 Changes in SCHEMA_VERSION = 70:
     - event_reference_hashes is no longer written to.
@@ -71,6 +73,7 @@ Changes in SCHEMA_VERSION = 70:
 SCHEMA_COMPAT_VERSION = (
     # We now assume that `device_lists_changes_in_room` has been filled out for
     # recent device_list_updates.
+    # ... and that `application_services_state.last_txn` is not used.
     69
 )
 """Limit on how far the synapse codebase can be rolled back without breaking db compat