diff --git a/synapse/storage/schema/full_schemas/11/event_edges.sql b/synapse/storage/schema/full_schemas/11/event_edges.sql
index 52eec883576be26ed8a0e6d40fda36294e855f15..bccd1c6f745f78eab821c774e7ba7aa22736352f 100644
--- a/synapse/storage/schema/full_schemas/11/event_edges.sql
+++ b/synapse/storage/schema/full_schemas/11/event_edges.sql
@@ -37,6 +37,8 @@ CREATE TABLE IF NOT EXISTS event_edges(
     event_id TEXT NOT NULL,
     prev_event_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
+    -- We no longer insert prev_state into this table, so all new rows will have
+    -- is_state as false.
     is_state BOOL NOT NULL,
     UNIQUE (event_id, prev_event_id, room_id, is_state)
 );