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-rw-r--r--synapse/storage/schema/delta/39/appservice_room_list.sql2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/39/appservice_room_list.sql b/synapse/storage/schema/delta/39/appservice_room_list.sql
index 7e8344a577..74bdc49073 100644
--- a/synapse/storage/schema/delta/39/appservice_room_list.sql
+++ b/synapse/storage/schema/delta/39/appservice_room_list.sql
@@ -19,6 +19,8 @@ CREATE TABLE appservice_room_list(
     room_id TEXT NOT NULL
 );
 
+-- Each appservice can have multiple published room lists associated with them,
+-- keyed of a particular network_id
 CREATE UNIQUE INDEX appservice_room_list_idx ON appservice_room_list(
     appservice_id, network_id, room_id
 );