diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
new file mode 100644
index d4a1d36..9119929
*** a/doc/src/sgml/catalogs.sgml
--- b/doc/src/sgml/catalogs.sgml
***************
*** 6964,6970 ****
        <entry><type>text</type></entry>
        <entry></entry>
        <entry>
!        Virtual ID of a transaction, or null if the object is not a
         virtual transaction ID
        </entry>
       </row>
--- 6964,6970 ----
        <entry><type>text</type></entry>
        <entry></entry>
        <entry>
!        Virtual ID of a transaction lock, or null if the lock object is not a
         virtual transaction ID
        </entry>
       </row>
***************
*** 6973,6979 ****
        <entry><type>xid</type></entry>
        <entry></entry>
        <entry>
!        ID of a transaction, or null if the object is not a transaction ID
        </entry>
       </row>
       <row>
--- 6973,6979 ----
        <entry><type>xid</type></entry>
        <entry></entry>
        <entry>
!        ID of a transaction lock, or null if the lock object is not a transaction ID
        </entry>
       </row>
       <row>