diff --git a/src/backend/executor/execReplication.c b/src/backend/executor/execReplication.c
index 8ad78366a86..173d2fe548d 100644
--- a/src/backend/executor/execReplication.c
+++ b/src/backend/executor/execReplication.c
@@ -46,8 +46,8 @@ static bool tuples_equal(TupleTableSlot *slot1, TupleTableSlot *slot2,
  *
  * Returns how many columns to use for the index scan.
  *
- * This is not generic routine, idxrel must be PK, RI, or an index that can be
- * used for REPLICA IDENTITY FULL table. See FindUsableIndexForReplicaIdentityFull()
+ * This is not a generic routine, idxrel must be PK, RI, or an index that can be
+ * used for a REPLICA IDENTITY FULL table. See FindUsableIndexForReplicaIdentityFull()
  * for details.
  *
  * By definition, replication identity of a rel meets all limitations associated