diff --git a/lisp/org-exp.el b/lisp/org-exp.el
index 95b9ad8..b359da1 100644
--- a/lisp/org-exp.el
+++ b/lisp/org-exp.el
@@ -4067,6 +4067,7 @@ lang=\"%s\" xml:lang=\"%s\">
          (when org-export-creator-info
            (insert (format "<p class=\"creator\">HTML generated by org-mode %s in emacs %s</p>\n"
                            org-version emacs-major-version)))
+         (insert "<p class=\"xhtml-validation\"><a href=\"http://validator.w3.org/check?uri=referer\" target=\"_blank\">Validate XHTML 1.0</a></p>")
          (insert "</div>"))
 
        (if org-export-html-with-timestamp
</#part>

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