diff --git a/doc/src/sgml/ref/ecpg-ref.sgml b/doc/src/sgml/ref/ecpg-ref.sgml
index 7bfee805a7..df3c1054f0 100644
--- a/doc/src/sgml/ref/ecpg-ref.sgml
+++ b/doc/src/sgml/ref/ecpg-ref.sgml
@@ -79,8 +79,8 @@ PostgreSQL documentation
      <listitem>
       <para>
        Set a compatibility mode.  <replaceable>mode</replaceable> can
-       be <literal>INFORMIX</literal> or
-       <literal>INFORMIX_SE</literal>.
+       be <literal>INFORMIX</literal>,
+       <literal>INFORMIX_SE</literal>, or <literal>ORACLE</literal>.
       </para>
      </listitem>
     </varlistentry>