-Returns a list of SQL statements to add this column to an existing table. (To
-create a new table, see L<DBIx::DBSchema::Table/sql_create_table> instead.)
+Returns SQL to add this column to an existing table. (To create a new table,
+see L<DBIx::DBSchema::Table/sql_create_table> instead.)
+
+NOTE: This interface has changed in 0.41
+
+Returns two listrefs. The first is a list of column alteration SQL fragments
+for an ALTER TABLE statement. The second is a list of full SQL statements that
+should be run after the ALTER TABLE statement.