diff --git a/doc/src/sgml/xindex.sgml b/doc/src/sgml/xindex.sgml
index 4fac018..4a8eb1b 100644
--- a/doc/src/sgml/xindex.sgml
+++ b/doc/src/sgml/xindex.sgml
@@ -416,7 +416,7 @@
    </table>
 
   <para>
-   GiST indexes require seven support functions, with an optional eighth, as
+   GiST indexes require nine support functions, two of which are optional, as
    shown in <xref linkend="xindex-gist-support-table">.
    (For more information see <xref linkend="GiST">.)
   </para>
@@ -477,6 +477,11 @@
        <entry>determine distance from key to query value (optional)</entry>
        <entry>8</entry>
       </row>
+      <row>
+       <entry><function>fetch</></entry>
+       <entry>compute original representation of a compressed key for index-only scans (optional)</entry>
+       <entry>9</entry>
+      </row>
      </tbody>
     </tgroup>
    </table>