diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 1d9127e94e..269809dc81 100644
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -2263,6 +2263,8 @@ TIMESTAMP WITH TIME ZONE '2004-10-19 10:23:54+02'
       then it is assumed to be in the time zone indicated by the system's
       <xref linkend="guc-timezone"/> parameter, and is converted to UTC using the
       offset for the <varname>timezone</varname> zone.
+      In either case, the originally stated or assumed time zone is not
+      retained.
      </para>
 
      <para>