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-rw-r--r--synapse/storage/schema/delta/42/current_state_delta.sql2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/schema/delta/42/current_state_delta.sql b/synapse/storage/schema/delta/42/current_state_delta.sql
index bf124f3def..d28851aff8 100644
--- a/synapse/storage/schema/delta/42/current_state_delta.sql
+++ b/synapse/storage/schema/delta/42/current_state_delta.sql
@@ -20,7 +20,7 @@ CREATE TABLE current_state_delta_stream (
     type TEXT NOT NULL,
     state_key TEXT NOT NULL,
     event_id TEXT,  -- Is null if the key was removed
-    prev_event_id TEXT
+    prev_event_id TEXT  -- Is null if the key was added
 );
 
 CREATE INDEX current_state_delta_stream_idx ON current_state_delta_stream(stream_id);