diff --git a/share/sgml/man-refs.ent b/share/sgml/man-refs.ent
index bda2db8a9a..b7e54db760 100644
--- a/share/sgml/man-refs.ent
+++ b/share/sgml/man-refs.ent
@@ -566,6 +566,7 @@
 <!ENTITY man.sgsc.1 "<citerefentry/<refentrytitle/sgsc/<manvolnum/1//">
 <!ENTITY man.sh.1 "<citerefentry/<refentrytitle/sh/<manvolnum/1//">
 <!ENTITY man.sha1.1 "<citerefentry/<refentrytitle/sha1/<manvolnum/1//">
+<!ENTITY man.sha256.1 "<citerefentry/<refentrytitle/sha256/<manvolnum/1//">
 <!ENTITY man.shar.1 "<citerefentry/<refentrytitle/shar/<manvolnum/1//">
 <!ENTITY man.shift.1 "<citerefentry/<refentrytitle/shift/<manvolnum/1//">
 <!ENTITY man.shutdown.1 "<citerefentry/<refentrytitle/shutdown/<manvolnum/1//">