diff --git a/doc/src/sgml/ref/refresh_materialized_view.sgml b/doc/src/sgml/ref/refresh_materialized_view.sgml
new file mode 100644
index fd06f1f..8ae6267
*** a/doc/src/sgml/ref/refresh_materialized_view.sgml
--- b/doc/src/sgml/ref/refresh_materialized_view.sgml
*************** REFRESH MATERIALIZED VIEW [ CONCURRENTLY
*** 63,70 ****
       <para>
        This option is only allowed if there is at least one
        <literal>UNIQUE</literal> index on the materialized view which uses only
!       column names and includes all rows; that is, it must not index on any
!       expressions nor include a <literal>WHERE</literal> clause.
       </para>
       <para>
        This option may not be used when the materialized view is not already
--- 63,70 ----
       <para>
        This option is only allowed if there is at least one
        <literal>UNIQUE</literal> index on the materialized view which uses only
!       column names and includes all rows;  that is, it must not be an
!       expression index or include a <literal>WHERE</literal> clause.
       </para>
       <para>
        This option may not be used when the materialized view is not already