diff --git a/share/xml/man-refs.ent b/share/xml/man-refs.ent
index a9db694bff..87fb28ba8e 100644
--- a/share/xml/man-refs.ent
+++ b/share/xml/man-refs.ent
@@ -624,6 +624,7 @@
 <!ENTITY man.strip.1 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>strip</refentrytitle><manvolnum>1</manvolnum></citerefentry>">
 <!ENTITY man.stty.1 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>stty</refentrytitle><manvolnum>1</manvolnum></citerefentry>">
 <!ENTITY man.su.1 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>su</refentrytitle><manvolnum>1</manvolnum></citerefentry>">
+<!ENTITY man.sudo.8 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>sudo</refentrytitle><manvolnum>8</manvolnum></citerefentry>">
 <!ENTITY man.sum.1 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>sum</refentrytitle><manvolnum>1</manvolnum></citerefentry>">
 <!ENTITY man.suspend.1 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>suspend</refentrytitle><manvolnum>1</manvolnum></citerefentry>">
 <!ENTITY man.svn.1 "<citerefentry xmlns='http://docbook.org/ns/docbook'><refentrytitle>svn</refentrytitle><manvolnum>1</manvolnum></citerefentry>">