*** a/doc/src/sgml/libpq.sgml
--- b/doc/src/sgml/libpq.sgml
***************
*** 3827,3832 **** PGresult *PQgetResult(PGconn *conn);
--- 3827,3841 ----
         active and the necessary response data has not yet been read by
         <function>PQconsumeInput</function>.
        </para>
+ 
+       <note>
+        <para>
+         Even when <function>PQresultStatus</function> indicates a fatal
+         error, <function>PQgetResult</function> must be called until it
+         returns a null pointer.  This allows <application>libpq</> to
+         process the error information completely.
+        </para>
+       </note>
       </listitem>
      </varlistentry>
     </variablelist>