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-rw-r--r--src/backend/optimizer/plan/planner.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index a0a2de7ee4b..f3856c519f6 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6758,7 +6758,8 @@ plan_cluster_use_sort(Oid tableOid, Oid indexOid)
* CREATE INDEX should request for use
*
* tableOid is the table on which the index is to be built. indexOid is the
- * OID of an index to be created or reindexed (which must be a btree index).
+ * OID of an index to be created or reindexed (which must be an index with
+ * support for parallel builds - currently btree or BRIN).
*
* Return value is the number of parallel worker processes to request. It
* may be unsafe to proceed if this is 0. Note that this does not include the