doc comments: rendering engines are another UTF8 restriction

diff --git a/doc/src/sgml/release.sgml b/doc/src/sgml/release.sgml
index 339618ddd296a18e8f13f811e555374a02ded22a..18b812c16606258ef1e65c9f962c4cdb25dd4fdd 100644 (file)
--- a/doc/src/sgml/release.sgml
+++ b/doc/src/sgml/release.sgml
@@ -27,7 +27,8 @@ non-ASCII characters            find using grep -P '[\x80-\xFF]'
                        http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references
 
         We cannot use UTF8 because back branches still use SGML Docbook,
-   which does not support it.
+   which does not support it.  Also, rendering engines have to
+   support the referenced characters.
 
         Do not use numeric _UTF_ numeric character escapes (&#nnn;),
         we can only use Latin1.