diff --git a/src/backend/partitioning/partbounds.c b/src/backend/partitioning/partbounds.c
index 73dea0375be..7d3580cbc10 100644
--- a/src/backend/partitioning/partbounds.c
+++ b/src/backend/partitioning/partbounds.c
@@ -5405,7 +5405,7 @@ check_partition_bounds_for_split_range(Relation parent,
 							errmsg("lower bound of partition \"%s\" is not equal to lower bound of split partition \"%s\"",
 								   relname,
 								   get_rel_name(splitPartOid)),
-							errhint("%s require combined bounds of new partitions must exactly match the bound of the split partition.",
+							errhint("%s requires the combined bounds of the new partitions to exactly match the bound of the split partition.",
 									"ALTER TABLE ... SPLIT PARTITION"),
 							parser_errposition(pstate, exprLocation((Node *) datum)));
 			}
@@ -5415,8 +5415,7 @@ check_partition_bounds_for_split_range(Relation parent,
 						errmsg("lower bound of partition \"%s\" is less than lower bound of split partition \"%s\"",
 							   relname,
 							   get_rel_name(splitPartOid)),
-						errhint("%s require combined bounds of new partitions must exactly match the bound of the split partition.",
-								"ALTER TABLE ... SPLIT PARTITION"),
+						errhint("Explicit partition bounds must be contained within the bounds of the split partition when a DEFAULT partition is specified."),
 						parser_errposition(pstate, exprLocation((Node *) datum)));
 		}
 
@@ -5448,7 +5447,7 @@ check_partition_bounds_for_split_range(Relation parent,
 							errmsg("upper bound of partition \"%s\" is not equal to upper bound of split partition \"%s\"",
 								   relname,
 								   get_rel_name(splitPartOid)),
-							errhint("%s require combined bounds of new partitions must exactly match the bound of the split partition.",
+							errhint("%s requires the combined bounds of the new partitions to exactly match the bound of the split partition.",
 									"ALTER TABLE ... SPLIT PARTITION"),
 							parser_errposition(pstate, exprLocation((Node *) datum)));
 			}
@@ -5458,8 +5457,7 @@ check_partition_bounds_for_split_range(Relation parent,
 						errmsg("upper bound of partition \"%s\" is greater than upper bound of split partition \"%s\"",
 							   relname,
 							   get_rel_name(splitPartOid)),
-						errhint("%s require combined bounds of new partitions must exactly match the bound of the split partition.",
-								"ALTER TABLE ... SPLIT PARTITION"),
+						errhint("Explicit partition bounds must be contained within the bounds of the split partition when a DEFAULT partition is specified."),
 						parser_errposition(pstate, exprLocation((Node *) datum)));
 		}
 	}
@@ -5654,7 +5652,7 @@ check_parent_values_in_new_partitions(Relation parent,
 				errmsg("new partitions' combined partition bounds do not contain value (%s) but split partition \"%s\" does",
 					   "NULL",
 					   get_rel_name(partOid)),
-				errhint("%s require combined bounds of new partitions must exactly match the bound of the split partition.",
+				errhint("%s requires the combined bounds of the new partitions to exactly match the bound of the split partition.",
 						"ALTER TABLE ... SPLIT PARTITION"));
 
 	/*
@@ -5697,7 +5695,7 @@ check_parent_values_in_new_partitions(Relation parent,
 				errmsg("new partitions' combined partition bounds do not contain value (%s) but split partition \"%s\" does",
 					   deparse_expression((Node *) notFoundVal, NIL, false, false),
 					   get_rel_name(partOid)),
-				errhint("%s require combined bounds of new partitions must exactly match the bound of the split partition.",
+				errhint("%s requires the combined bounds of the new partitions to exactly match the bound of the split partition.",
 						"ALTER TABLE ... SPLIT PARTITION"));
 	}
 }
diff --git a/src/test/regress/expected/partition_split.out b/src/test/regress/expected/partition_split.out
index a2ccbe5138b..2b9a6aa50ed 100644
--- a/src/test/regress/expected/partition_split.out
+++ b/src/test/regress/expected/partition_split.out
@@ -56,7 +56,7 @@ ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
 ERROR:  lower bound of partition "sales_feb2022" is not equal to lower bound of split partition "sales_feb_mar_apr2022"
 LINE 2:   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-01-01') TO...
                                                     ^
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  ALTER TABLE ... SPLIT PARTITION requires the combined bounds of the new partitions to exactly match the bound of the split partition.
 -- ERROR
 -- (We can create partition with the same name as split partition, but can't create two partitions with the same name)
 ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
@@ -97,7 +97,7 @@ ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
 ERROR:  upper bound of partition "sales_apr2022" is not equal to upper bound of split partition "sales_feb_mar_apr2022"
 LINE 4: ... sales_apr2022 FOR VALUES FROM ('2022-04-01') TO ('2022-06-0...
                                                              ^
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  ALTER TABLE ... SPLIT PARTITION requires the combined bounds of the new partitions to exactly match the bound of the split partition.
 -- ERROR
 ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-02-01') TO ('2022-03-01'),
@@ -118,7 +118,7 @@ ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
 ERROR:  lower bound of partition "sales_feb2022" is not equal to lower bound of split partition "sales_feb_mar_apr2022"
 LINE 2:   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-02-02') TO...
                                                     ^
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  ALTER TABLE ... SPLIT PARTITION requires the combined bounds of the new partitions to exactly match the bound of the split partition.
 -- Check the source partition not in the search path
 SET search_path = partition_split_schema2, public;
 ALTER TABLE partition_split_schema.sales_range
@@ -154,7 +154,7 @@ ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
 ERROR:  upper bound of partition "sales_apr2022" is not equal to upper bound of split partition "sales_feb_mar_apr2022"
 LINE 4: ... sales_apr2022 FOR VALUES FROM ('2022-04-01') TO ('2022-06-0...
                                                              ^
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  ALTER TABLE ... SPLIT PARTITION requires the combined bounds of the new partitions to exactly match the bound of the split partition.
 DROP TABLE sales_range;
 --
 -- Add rows into partitioned table then split partition
@@ -917,14 +917,14 @@ ALTER TABLE sales_list SPLIT PARTITION sales_all INTO
    PARTITION sales_east FOR VALUES IN ('Beijing', 'Delhi', 'Vladivostok'),
    PARTITION sales_central FOR VALUES IN ('Warsaw', 'Berlin', 'Kyiv'));
 ERROR:  new partitions' combined partition bounds do not contain value (NULL) but split partition "sales_all" does
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  ALTER TABLE ... SPLIT PARTITION requires the combined bounds of the new partitions to exactly match the bound of the split partition.
 -- ERROR
 ALTER TABLE sales_list SPLIT PARTITION sales_all INTO
   (PARTITION sales_west FOR VALUES IN ('Lisbon', 'New York', 'Madrid'),
    PARTITION sales_east FOR VALUES IN ('Beijing', 'Delhi', 'Vladivostok'),
    PARTITION sales_central FOR VALUES IN ('Warsaw', 'Berlin', NULL));
 ERROR:  new partitions' combined partition bounds do not contain value ('Kyiv'::character varying(20)) but split partition "sales_all" does
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  ALTER TABLE ... SPLIT PARTITION requires the combined bounds of the new partitions to exactly match the bound of the split partition.
 -- ERROR
 ALTER TABLE sales_list SPLIT PARTITION sales_all INTO
   (PARTITION sales_west FOR VALUES IN ('Lisbon', 'New York', 'Madrid'),
@@ -1201,7 +1201,7 @@ ALTER TABLE t SPLIT PARTITION tp_0_51 INTO
 ERROR:  upper bound of partition "tp_0_51" is greater than upper bound of split partition "tp_0_51"
 LINE 2:   (PARTITION tp_0_51 FOR VALUES FROM (0) TO (53),
                                                      ^
-HINT:  ALTER TABLE ... SPLIT PARTITION require combined bounds of new partitions must exactly match the bound of the split partition.
+HINT:  Explicit partition bounds must be contained within the bounds of the split partition when a DEFAULT partition is specified.
 DROP TABLE t;
 --
 -- Try to SPLIT partition of another table.