diff --git a/doc/src/sgml/xfunc.sgml b/doc/src/sgml/xfunc.sgml
new file mode 100644
index 9de7ccc..9c15950
*** a/doc/src/sgml/xfunc.sgml
--- b/doc/src/sgml/xfunc.sgml
*************** memcpy(destination->data, buffer, 40);
*** 1955,1960 ****
--- 1955,1965 ----
           <entry><filename>utils/nabstime.h</filename></entry>
          </row>
          <row>
+          <entry><type>bigint</type> (<type>int8</type>)</entry>
+          <entry><type>int64</type></entry>
+          <entry><filename>postgres.h</filename></entry>
+         </row>
+         <row>
           <entry><type>boolean</type></entry>
           <entry><type>bool</type></entry>
           <entry><filename>postgres.h</filename> (maybe compiler built-in)</entry>