diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
new file mode 100644
index bf568f1..3bcd82c
*** a/doc/src/sgml/catalogs.sgml
--- b/doc/src/sgml/catalogs.sgml
***************
*** 7413,7420 ****
     high-order half in the <structfield>classid</> column, its low-order half
     in the <structfield>objid</> column, and <structfield>objsubid</> equal
     to 1. The original <type>bigint</type> value can be reassembled with the
!    expression <literal>(classid::int::bit(64) &lt;&lt; 32 |
!    objid::int::bit(64))::bigint</literal>. Integer keys are displayed with the
     first key in the
     <structfield>classid</> column, the second key in the <structfield>objid</>
     column, and <structfield>objsubid</> equal to 2.  The actual meaning of
--- 7413,7420 ----
     high-order half in the <structfield>classid</> column, its low-order half
     in the <structfield>objid</> column, and <structfield>objsubid</> equal
     to 1. The original <type>bigint</type> value can be reassembled with the
!    expression <literal>(classid::bigint &lt;&lt; 32) |
!    objid::bigint</literal>. Integer keys are displayed with the
     first key in the
     <structfield>classid</> column, the second key in the <structfield>objid</>
     column, and <structfield>objsubid</> equal to 2.  The actual meaning of