Add warning that autocommit=off is not well-supported yet.

doc/src/sgml/runtime.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.145 2002/10/13 16:55:05 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.146 2002/10/20 01:43:32 tgl Exp $
 -->
 
 <Chapter Id="runtime">
@@ -1245,6 +1245,7 @@ env PGOPTIONS='-c geqo=off' psql
 	maximum compatibility with the SQL specification, set it to
 	false.
        </para>
+
        <note>
         <para>
 	 Even with <varname>autocommit</> set to false, <command>SET</>,
@@ -1261,6 +1262,16 @@ env PGOPTIONS='-c geqo=off' psql
         </para>
        </note>
 
+       <note>
+        <para>
+	 As of <productname>PostgreSQL</productname> 7.3, setting
+	 <varname>autocommit</> to false is not well-supported.
+	 This is a new feature and is not yet handled by all client
+	 libraries and applications.  Before making it the default
+	 setting in your installation, test carefully.
+        </para>
+       </note>
+
       </listitem>
      </varlistentry>