I think the period here should be a typo.
index 16b5803d388..af3b15e93df 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -185,7 +185,7 @@ typedef struct ComputeXidHorizonsResult
FullTransactionId latest_completed;
/*
- * The same for procArray->replication_slot_xmin and.
+ * The same for procArray->replication_slot_xmin and
* procArray->replication_slot_catalog_xmin.
*/
--
Regards
Junwang Zhao