diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 77cacdd..520170b 100644
*** a/doc/src/sgml/config.sgml
--- b/doc/src/sgml/config.sgml
*************** SET ENABLE_SEQSCAN TO OFF;
*** 2424,2430 ****
          space.  This parameter has no effect on the size of shared
          memory allocated by <productname>PostgreSQL</productname>, nor
          does it reserve kernel disk cache; it is used only for estimation
!         purposes.  The default is 128 megabytes (<literal>128MB</>).
         </para>
        </listitem>
       </varlistentry>
--- 2424,2432 ----
          space.  This parameter has no effect on the size of shared
          memory allocated by <productname>PostgreSQL</productname>, nor
          does it reserve kernel disk cache; it is used only for estimation
!         purposes.  The system also does not assume data remains in
!         the disk cache between queries.  The default is 128 megabytes
!         (<literal>128MB</>).
         </para>
        </listitem>
       </varlistentry>