diff --git a/pg_stat_monitor.h b/pg_stat_monitor.h
index 8cf5959..e869a82 100644
--- a/pg_stat_monitor.h
+++ b/pg_stat_monitor.h
@@ -326,8 +326,9 @@ typedef struct Counters
 	JitInfo		jitinfo;
 	ErrorInfo	error;
 	Wal_Usage	walusage;
-	int			resp_calls[MAX_RESPONSE_BUCKET];	/* execution time's in
-													 * msec */
+	int			resp_calls[MAX_RESPONSE_BUCKET + 2];	/* execution time's in
+											 * msec; including 2
+											 * outlier buckets */
 	int64		parallel_workers_to_launch; /* # of parallel workers planned
 											 * to be launched */
 	int64		parallel_workers_launched;	/* # of parallel workers actually