diff --git a/share/sgml/man-refs.ent b/share/sgml/man-refs.ent
index 0428fb0965..a5511c752c 100644
--- a/share/sgml/man-refs.ent
+++ b/share/sgml/man-refs.ent
@@ -3445,6 +3445,7 @@
 <!ENTITY man.mouse.4 "<citerefentry/<refentrytitle/mouse/<manvolnum/4//">
 <!ENTITY man.mpt.4 "<citerefentry/<refentrytitle/mpt/<manvolnum/4//">
 <!ENTITY man.mse.4 "<citerefentry/<refentrytitle/mse/<manvolnum/4//">
+<!ENTITY man.msk.4 "<citerefentry/<refentrytitle/msk/<manvolnum/4//">
 <!ENTITY man.mtio.4 "<citerefentry/<refentrytitle/mtio/<manvolnum/4//">
 <!ENTITY man.multicast.4 "<citerefentry/<refentrytitle/multicast/<manvolnum/4//">
 <!ENTITY man.mxge.4 "<citerefentry/<refentrytitle/mxge/<manvolnum/4//">